{"id":2728,"date":"2015-03-25T19:09:45","date_gmt":"2015-03-25T19:09:45","guid":{"rendered":"http:\/\/bestkora.com\/IosDeveloper\/?p=2728"},"modified":"2016-01-17T19:56:47","modified_gmt":"2016-01-17T19:56:47","slug":"zadanie-2-reshenie-prodolzhenie-obyazatelnye-punkty-5-8-swift-1-2-i-swift-2-0","status":"publish","type":"post","link":"https:\/\/bestkora.com\/IosDeveloper\/zadanie-2-reshenie-prodolzhenie-obyazatelnye-punkty-5-8-swift-1-2-i-swift-2-0\/","title":{"rendered":"\u0417\u0430\u0434\u0430\u043d\u0438\u0435 2. \u0420\u0435\u0448\u0435\u043d\u0438\u0435 &#8212; \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0435\u043d\u0438\u0435 (\u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043f\u0443\u043d\u043a\u0442\u044b 5-8) Swift 1.2 \u0438 Swift 2.0"},"content":{"rendered":"<p>\u0422\u0435\u043a\u0441\u0442 \u0414\u043e\u043c\u0430\u0448\u043d\u0435\u0433\u043e \u0437\u0430\u0434\u0430\u043d\u0438\u044f \u043d\u0430 \u0430\u043d\u0433\u043b\u0438\u0439\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043d\u0430\u00a0<strong><span style=\"color: #373737;\">\u00a0<\/span><a style=\"color: #1982d1;\" title=\"Developing iOS 7 Apps: Assignment 1\" href=\"https:\/\/itunes.apple.com\/us\/course\/developing-ios-8-apps-swift\/id961180099\" target=\"_blank\">iTunes \u0432 \u043f\u0443\u043d\u043a\u0442\u0435 \u201cDeveloping iOS 8 app: Programming: Project 2\u2033<\/a><\/strong><span style=\"color: #373737;\">. \u00a0\u0422\u0435\u043a\u0441\u0442 \u0414\u043e\u043c\u0430\u0448\u043d\u0435\u0433\u043e \u0437\u0430\u0434\u0430\u043d\u0438\u044f \u043d\u0430\u00a0\u0440\u0443\u0441\u0441\u043a\u043e\u043c\u00a0\u00a0\u044f\u0437\u044b\u043a\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043d\u0430 <p><span class=\"gdm-drivefile-embed\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ssl.gstatic.com\/docs\/doclist\/images\/icon_12_pdf_list.png\" width=\"16\" height=\"16\" \/> <a href=\"https:\/\/drive.google.com\/file\/d\/0B0jZOSo2e4NmNW5OWHRhN2FkY0E\/view?usp=drivesdk\" target=\"&quot;_blank&quot;\">\u0417\u0430\u0434\u0430\u043d\u0438\u0435 2 iOS 8_new.pdf<\/a><\/span><\/p>\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0437\u0430\u0434\u0430\u043d\u0438\u044f \u043c\u043e\u0436\u043d\u043e \u043e\u0431\u0441\u0443\u0436\u0434\u0430\u0442\u044c \u043d\u0430 \u0444\u043e\u0440\u0443\u043c\u0435\u00a0<strong><a href=\"https:\/\/groups.google.com\/forum\/?hl=ru#!forum\/swiftru\">Swift[ru]<\/a><\/strong>\u00a0. \u0412\u0430\u0448\u0435 \u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043b\u0443\u0447\u0448\u0435 \u0438 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u0435\u0435. \u0412\u044b\u043a\u043b\u0430\u0434\u044b\u0432\u0430\u0439\u0442\u0435 \u0435\u0433\u043e \u0432<strong>\u00a0Github<\/strong>,\u00a0\u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u0441\u0441\u044b\u043b\u043a\u0443 \u043d\u0430\u00a0<strong>Dropbox<\/strong>\u00a0\u0438\u043b\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0439\u0442\u0435 \u0434\u0440\u0443\u0433\u0438\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0432\u0435\u0440\u0441\u0438\u044f\u043c\u0438.\u00a0<strong>Xcode<\/strong>\u00a0\u00a0\u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u043d\u0430\u043f\u0440\u044f\u043c\u0443\u044e \u0441\u00a0<strong>Github.<\/strong><\/span><\/p>\n<p>\u041d\u0430\u0447\u0430\u043b\u043e \u0440\u0435\u0448\u0435\u043d\u0438\u044f \u0417\u0430\u0434\u0430\u043d\u0438\u044f 2 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f\u00a0<strong><a href=\"https:\/\/bestkora.com\/IosDeveloper\/zadanie-2-reshenie-nachalo-obyazatelnye-punkty-1-4-swift-1-2-i-swift-2-0\/\">\u0437\u0434\u0435\u0441\u044c<\/a><\/strong>.<\/p>\n<h2>\u041f\u0443\u043d\u043a\u0442 5 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0439<\/h2>\n<blockquote><p><strong>\u0414\u043e\u0431\u0430\u0432\u044c\u0442\u0435 \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u0438 \u0432\u0430\u0448\u0435\u043c\u0443\u00a0<span style=\"color: #0000ff;\">CalculatorBrain<\/span>\u00a0\u00a0\u043f\u043e\u043c\u0435\u0449\u0430\u0442\u044c \u201c\u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435\u201d \u00a0\u0432 \u0435\u0433\u043e \u00a0\u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0438\u0439 \u0441\u0442\u044d\u043a. \u0421\u0434\u0435\u043b\u0430\u0439\u0442\u0435 \u044d\u0442\u043e \u043f\u0443\u0442\u0435\u043c \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0433\u043e API \u0432 \u0432\u0430\u0448\u0435\u043c\u00a0<span style=\"color: #0000ff;\">CalculatorBrain<\/span>\u00a0&#8230;<\/strong><\/p>\n<p><strong><span style=\"color: #0000ff;\">func pushOperand (symbol:String) -&gt; Double?<\/span><\/strong><\/p>\n<p><strong><span style=\"color: #0000ff;\">var variableValues:Dictionary&lt;String, Double&gt;<\/span><\/strong><\/p>\n<p><strong><strong>\u042d\u0442\u043e \u0434\u043e\u043b\u0436\u043d\u043e \u0434\u0435\u043b\u0430\u0442\u044c \u0442\u043e\u0447\u043d\u043e \u0442\u043e, \u0447\u0442\u043e \u0433\u043e\u0432\u043e\u0440\u044f\u0442 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u044f : \u043f\u0435\u0440\u0432\u0430\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u044f \u201c\u0442\u043e\u043b\u043a\u0430\u0435\u0442\u201d \u201c\u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e\u201d \u0432\u043e \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0438\u0439 \u0441\u0442\u044d\u043a\u00a0<span style=\"color: #0000ff;\">CalculatorBrain<\/span>\u00a0(\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440,\u00a0<span style=\"color: #0000ff;\"><b>pushOperand<\/b>\u00a0(\u201cx\u201d)<\/span>\u00a0\u00a0\u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u043c\u0435\u0449\u0430\u0442\u044c \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e \u0441 \u0438\u043c\u0435\u043d\u0435\u043c\u00a0<span style=\"color: #0000ff;\">\u0445<\/span>), \u0430 \u0432\u0442\u043e\u0440\u0430\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f \u0432\u0432\u0438\u0434\u0435 \u0441\u043b\u043e\u0432\u0430\u0440\u044f \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e\u00a0<span style=\"color: #0000ff;\">CalculatorBrain<\/span>\u00a0\u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u043b\u044e\u0431\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0434\u043b\u044f \u043b\u044e\u0431\u043e\u0439 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440,\u00a0<span style=\"color: #0000ff;\">brain.variableValues [\u201cx\u201d] = 35.0<\/span>) .\u00a0<span style=\"color: #0000ff;\"><b>pushOperand<\/b><\/span>\u00a0\u0434\u043e\u043b\u0436\u0435\u043d \u0432\u0435\u0440\u043d\u0443\u0442\u044c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u00a0<span style=\"color: #0000ff;\"><b>evaluate()<\/b><\/span>\u00a0\u043f\u043e\u0441\u043b\u0435 \u043f\u043e\u043c\u0435\u0449\u0435\u043d\u0438\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 \u0432 \u0441\u0442\u044d\u043a (\u043a\u0430\u043a\u00a0<span style=\"color: #0000ff;\">pushOperand<\/span>\u00a0\u0434\u0435\u043b\u0430\u0435\u0442 \u0432 \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u043b\u0443\u0447\u0430\u044f\u0445).<\/strong><\/strong><\/p><\/blockquote>\n<p>\u0412 \u043d\u0430\u0448\u0435\u0439\u00a0<strong>\u041c\u043e\u0434\u0435\u043b\u0438<\/strong>\u00a0<strong><span style=\"color: #0000ff;\">CalculatorBrain<\/span><\/strong>\u00a0\u0434\u043e\u0431\u0430\u0432\u043b\u044f\u0435\u043c \u0432 \u043f\u0435\u0440\u0435\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0435\u00a0<strong><span style=\"color: #0000ff;\"><em>enum<\/em><\/span><\/strong>\u00a0\u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445\u00a0<strong><span style=\"color: #0000ff;\">Variable<\/span><\/strong>:<\/p>\n<p><a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-2.57.03-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-1582 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-2.57.03-PM.png\" alt=\"Screen Shot 2015-03-26 at 2.57.03 PM\" width=\"884\" height=\"400\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-2.57.03-PM.png 884w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-2.57.03-PM-300x136.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-2.57.03-PM-500x226.png 500w\" sizes=\"auto, (max-width: 884px) 100vw, 884px\" \/><\/a><br \/>\n\u0424\u0443\u043d\u043a\u0446\u0438\u044f\u00a0<strong><span style=\"color: #0000ff;\">func pushOperand (symbol:String) -&gt; Double?\u00a0<\/span><\/strong>\u0434\u043b\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u0433\u043b\u044f\u0434\u0435\u0442\u044c \u0442\u043e\u0447\u043d\u043e \u0442\u0430\u043a\u0436\u0435, \u043a\u0430\u043a \u0438 \u0443\u0436\u0435 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0430\u044f, \u0442\u043e\u043b\u044c\u043a\u043e \u0432\u043c\u0435\u0441\u0442\u043e \u043e\u043f\u0435\u0440\u0430\u043d\u0434\u0430 \u043c\u044b \u0431\u0443\u0434\u0435\u043c \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u0442\u044c \u0432 \u0441\u0442\u044d\u043a \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e<\/p>\n<p><!--more--><\/p>\n<p><a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.05.37-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-1583 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.05.37-PM.png\" alt=\"Screen Shot 2015-03-26 at 3.05.37 PM\" width=\"790\" height=\"120\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.05.37-PM.png 790w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.05.37-PM-300x46.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.05.37-PM-500x76.png 500w\" sizes=\"auto, (max-width: 790px) 100vw, 790px\" \/><\/a><br \/>\n\u0421\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u0441\u043b\u043e\u0432\u0430\u0440\u044c \u0434\u043b\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445<\/p>\n<p><a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.11.59-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-1584 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.11.59-PM.png\" alt=\"Screen Shot 2015-03-26 at 3.11.59 PM\" width=\"820\" height=\"168\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.11.59-PM.png 820w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.11.59-PM-300x61.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.11.59-PM-500x102.png 500w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/a><\/p>\n<p>\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438\u00a0<strong><span style=\"color: #0000ff;\">evaluate<\/span><\/strong>\u00a0&#8212; \u044d\u0442\u043e \u0440\u0430\u0431\u043e\u0442\u0430 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0433\u043e \u043f\u0443\u043d\u043a\u0442\u0430 6 \u0417\u0430\u0434\u0430\u043d\u0438\u044f 2, \u0442\u0430\u043a \u0447\u0442\u043e \u043f\u043e\u043a\u0430 \u0432\u0435\u0440\u043d\u0435\u043c\u00a0<strong><span style=\"color: #0000ff;\">\u00a0nil<\/span><\/strong>\u00a0:<\/p>\n<p><a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.17.34-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-1585 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.17.34-PM.png\" alt=\"Screen Shot 2015-03-26 at 3.17.34 PM\" width=\"1020\" height=\"230\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.17.34-PM.png 1020w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.17.34-PM-300x68.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.17.34-PM-500x113.png 500w\" sizes=\"auto, (max-width: 1020px) 100vw, 1020px\" \/><\/a><br \/>\n\u0412\u043d\u0435\u0441\u0435\u043d\u043d\u044b\u0435 \u043d\u0430\u043c\u0438 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432\u00a0<strong>\u041c\u043e\u0434\u0435\u043b\u044c<\/strong>\u00a0<strong><span style=\"color: #0000ff;\">CalculatorBrain\u00a0<\/span><\/strong>\u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u043b\u0438\u0448\u044c \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043a\u043e\u0439 \u043a \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044e \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u043d\u0438\u043a\u0430\u043a\u0438\u0445 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0432 \u0440\u0430\u0431\u043e\u0442\u0435 \u043c\u044b \u043d\u0435 \u0441\u043c\u043e\u0436\u0435\u043c \u043f\u043e\u043a\u0430 \u0443\u0432\u0438\u0434\u0435\u0442\u044c.<br \/>\n\u041a\u043e\u0434 \u043c\u043e\u0436\u043d\u043e \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u043d\u0430\u00a0<strong><a href=\"https:\/\/github.com\/BestKora\/Calculator-cs193p-Winter-2015-Assigment-2\/tree\/Required5-6\">Github<\/a>.<\/strong><\/p>\n<h2>\u041f\u0443\u043d\u043a\u0442 6 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0439<\/h2>\n<blockquote><p><strong>\u0424\u0443\u043d\u043a\u0446\u0438\u044f\u00a0<span style=\"color: #0000ff;\">evaluate()<\/span>\u00a0\u0434\u043e\u043b\u0436\u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 (\u0438\u0437 \u0441\u043b\u043e\u0432\u0430\u0440\u044f<span style=\"color: #0000ff;\">\u00a0variableValues<\/span>) \u0432\u0441\u044f\u043a\u0438\u0439 \u0440\u0430\u0437, \u043a\u043e\u0433\u0434\u0430 \u201c\u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f\u201d \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u0438\u043b\u0438 \u0432\u0435\u0440\u043d\u0443\u0442\u044c\u00a0<span style=\"color: #0000ff;\">nil<\/span>, \u0435\u0441\u043b\u0438 \u043f\u0440\u0438 \u0440\u0430\u0441\u0441\u0447\u0435\u0442\u0435 \u043d\u0435 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u043f\u043e\u0434\u0445\u043e\u0434\u044f\u0449\u0435\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u044d\u0442\u043e\u0439 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439.<\/strong><\/p><\/blockquote>\n<p>\u042d\u0442\u043e \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442, \u0447\u0442\u043e \u043c\u044b \u0434\u043e\u043b\u0436\u043d\u044b \u0432\u0435\u0440\u043d\u0443\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0438\u0437 \u0441\u043b\u043e\u0432\u0430\u0440\u044f\u00a0<strong><span style=\"color: #0000ff;\">\u00a0variableValues<\/span><\/strong><br \/>\n<a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.30.45-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-1587 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.30.45-PM.png\" alt=\"Screen Shot 2015-03-26 at 3.30.45 PM\" width=\"1014\" height=\"222\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.30.45-PM.png 1014w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.30.45-PM-300x66.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.30.45-PM-500x109.png 500w\" sizes=\"auto, (max-width: 1014px) 100vw, 1014px\" \/><\/a><br \/>\n\u041c\u044b \u043c\u043e\u0436\u0435\u043c \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u043a\u0430\u043a \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0442 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435 \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u043f\u0440\u043e\u0441\u0442\u043e\u0433\u043e \u0442\u0435\u0441\u0442\u0430<br \/>\n<a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.34.28-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-1588 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.34.28-PM.png\" alt=\"Screen Shot 2015-03-26 at 3.34.28 PM\" width=\"838\" height=\"368\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.34.28-PM.png 838w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.34.28-PM-300x132.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-26-at-3.34.28-PM-500x220.png 500w\" sizes=\"auto, (max-width: 838px) 100vw, 838px\" \/><\/a><br \/>\n\u041a\u043e\u0434 \u043c\u043e\u0436\u043d\u043e \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u043d\u0430\u00a0<strong><a href=\"https:\/\/github.com\/BestKora\/Calculator-cs193p-Winter-2015-Assigment-2\/tree\/Required5-6\">Github<\/a>.<\/strong><\/p>\n<h2>\u041f\u0443\u043d\u043a\u0442 7 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0439<\/h2>\n<blockquote><p><strong><span style=\"color: #000000;\">\u0420\u0435\u0430\u043b\u0438\u0437\u0443\u0439\u0442\u0435 \u043d\u043e\u0432\u0443\u044e read-only (\u0442\u043e\u043b\u044c\u043a\u043e<span style=\"color: #0000ff;\">\u00a0get<\/span>, \u043d\u0435\u0442\u00a0<span style=\"color: #0000ff;\">set<\/span>) \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e<span style=\"color: #0000ff;\">\u00a0var\u00a0<\/span>\u0434\u043b\u044f\u00a0<span style=\"color: #0000ff;\">CalculatorBrain<\/span>, \u0447\u0442\u043e\u0431\u044b \u043e\u043f\u0438\u0441\u0430\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u201c\u043c\u043e\u0437\u0433\u043e\u0432\u201d \u043a\u0430\u043a\u00a0<span style=\"color: #0000ff;\">String<\/span>&#8230;<\/span><\/strong><\/p>\n<p><span style=\"color: #0000ff;\"><strong>var description: String<\/strong><\/span><\/p>\n<ul>\n<li>\u0423\u043d\u0430\u0440\u043d\u044b\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u0434\u043e\u043b\u0436\u043d\u044b \u0431\u044b\u0442\u044c \u043f\u043e\u043a\u0430\u0437\u0430\u043d\u044b \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043d\u043e\u0442\u0430\u0446\u0438\u0438 \u201c\u0444\u0443\u043d\u043a\u0446\u0438\u044f\u201d. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0432\u0432\u043e\u0434<span style=\"color: #000000;\">\u00a0<b>10 cos\u00a0<\/b><\/span>\u0434\u043e\u043b\u0436\u0435\u043d \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0430\u0442\u044c\u0441\u044f \u0432\u00a0<span style=\"color: #0000ff;\"><b>description<\/b><\/span>\u00a0\u043a\u0430\u043a\u00a0<span style=\"color: #000000;\"><b>cos (10)<\/b><\/span><\/li>\n<li>\u0411\u0438\u043d\u0430\u0440\u043d\u044b\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u0434\u043e\u043b\u0436\u043d\u044b \u0431\u044b\u0442\u044c \u043f\u043e\u043a\u0430\u0437\u0430\u043d\u044b \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u0438\u043d\u0444\u0438\u043a\u0441\u043d\u043e\u0439 (infix) \u043d\u043e\u0442\u0430\u0446\u0438\u0438. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0432\u0432\u043e\u0434\u00a0<b>3 \u21b2 5 &#8212;<\/b>\u00a0\u0434\u043e\u043b\u0436\u0435\u043d \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0430\u0442\u044c\u0441\u044f \u0432\u00a0<span style=\"color: #0000ff;\"><b>description<\/b><\/span>\u00a0\u043a\u0430\u043a \u00a0\u00a0<b>3 &#8212; 5<\/b>. \u0423\u0431\u0435\u0434\u0438\u0442\u0435\u0441\u044c, \u0447\u0442\u043e \u0432\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0438 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u044b\u0439 \u043f\u043e\u0440\u044f\u0434\u043e\u043a \u0447\u0438\u0441\u0435\u043b.<\/li>\n<li>\u0412\u0435\u0441\u044c \u0434\u0440\u0443\u0433\u043e\u0439 \u043a\u043e\u043d\u0442\u0435\u043d\u0442 \u0441\u0442\u044d\u043a\u0430 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043e\u043f\u0435\u0440\u0430\u043d\u0434\u044b, \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435, \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u044b \u043a\u0430\u043a<b>\u00a0\u03c0<\/b>\u00a0\u0438 \u00a0\u0442\u0430\u043a \u0434\u0430\u043b\u0435\u0435) \u0434\u043e\u043b\u0436\u043d\u044b \u0431\u044b\u0442\u044c \u043f\u043e\u043a\u0430\u0437\u0430\u043d\u044b \u201c\u043a\u0430\u043a \u0435\u0441\u0442\u044c\u201d. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440\u00a0<b>23.5<\/b>\u00a0\u21d2\u00a0<b>23.5<\/b>,\u00a0<b>\u03c0\u00a0<\/b>\u00a0\u21d2\u00a0<b>\u03c0\u00a0<\/b>(\u043d\u0435 3.1415!), \u201c\u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f\u201d\u00a0<b>x<\/b>\u00a0\u21d2\u00a0<b>\u00a0x\u00a0<\/b>(\u043d\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435) \u0438 \u0442.\u0434.<\/li>\n<li>\u041b\u044e\u0431\u044b\u0435 \u043a\u043e\u043c\u0431\u0438\u043d\u0430\u0446\u0438\u0438 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432 \u0441\u0442\u044d\u043a\u0430 \u0434\u043e\u043b\u0436\u043d\u044b \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0430\u0442\u044c\u0441\u044f \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440: \u00a0\u00a0\u00a0\u00a0\u00a0<b>10 \u221a 3 +<\/b>\u00a0\u00a0<b>\u00a0<\/b>\u00a0\u21d2\u00a0<b>\u221a (10) + \u00a03<\/b><\/li>\n<\/ul>\n<p><b>3 \u00a0\u21b2 5 +<\/b>\u00a0\u00a0<b>\u221a\u00a0<\/b>\u00a0\u21d2\u00a0<b>\u221a ( 3 + \u00a05)<\/b><\/p>\n<p><b>3 \u00a0\u21b2 5 \u221a \u00a0+ \u221a \u00a06 \u00f7<\/b>\u00a0\u00a0\u21d2<b>\u221a( 3 + \u221a (5)) \u00a0\u00a0\u00f7 \u00a06<\/b><\/p>\n<ul>\n<li>\u0415\u0441\u043b\u0438 \u0435\u0441\u0442\u044c \u043f\u0440\u043e\u043f\u0443\u0449\u0435\u043d\u043d\u044b\u0435 \u043e\u043f\u0435\u0440\u0430\u043d\u0434\u044b, \u0437\u0430\u043c\u0435\u043d\u044f\u0435\u043c \u0438\u0445 \u043d\u0430\u00a0<strong><span style=\"color: #0000ff;\">?<\/span><\/strong>, \u00a0\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440,<\/li>\n<\/ul>\n<p><b>3 \u21b2 \u00a0+\u00a0<\/b>\u21d2\u00a0<b>? + \u00a03<\/b><\/p>\n<ul>\n<li>\u0415\u0441\u043b\u0438 \u0432 \u0441\u0442\u044d\u043a\u0435 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0437\u0430\u043a\u043e\u043d\u0447\u0435\u043d\u043d\u044b\u0445 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0439, \u0440\u0430\u0437\u0434\u0435\u043b\u044f\u0435\u043c \u0438\u0445 \u0437\u0430\u043f\u044f\u0442\u044b\u043c\u0438. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440,\u00a0<b>3 \u21b2 5 + \u221a \u03c0 cos<\/b>\u00a0<b>\u21d2\u00a0<\/b><b>\u221a<\/b><b>(3+5), cos(\u03c0)<\/b>. \u0412\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044f \u0434\u043e\u043b\u0436\u043d\u044b \u0440\u0430\u0441\u043f\u043e\u043b\u0430\u0433\u0430\u0442\u044c\u0441\u044f \u0432 \u0438\u0441\u0442\u043e\u0440\u0438\u0447\u0435\u0441\u043a\u043e\u043c \u043f\u043e\u0440\u044f\u0434\u043a\u0435 \u0441 \u043d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u0441\u0442\u0430\u0440\u044b\u043c\u0438 \u0432\u043d\u0430\u0447\u0430\u043b\u0435 \u0441\u0442\u0440\u043e\u043a\u0438 \u0438 \u0441 \u043d\u0435\u0434\u0430\u0432\u043d\u043e<b>\u00a0push \/ perform\u00a0<\/b>\u0432 \u043a\u043e\u043d\u0446\u0435.<\/li>\n<li>\u0412\u0430\u0448\u00a0<span style=\"color: #0000ff;\"><b>description<\/b><\/span>\u00a0\u00a0\u0434\u043e\u043b\u0436\u0435\u043d \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0442\u044c \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0435 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0435. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440,\u00a0<b>\u00a03 \u00a0\u21b2 5 \u21b2 4 \u00a0+ \u00d7<\/b>\u00a0<b>\u043d\u0435 \u0434\u043e\u043b\u0436\u043d\u043e<\/b>\u00a0\u0431\u044b\u0442\u044c\u00a0<b>\u00a03 \u00d7 5 + \u00a04\u00a0<\/b>\u043e\u043d\u043e\u00a0<b>\u0434\u043e\u043b\u0436\u043d\u043e<\/b>\u00a0\u0431\u044b\u0442\u044c\u00a0<b>\u00a03 \u00d7 (5 + \u00a04)<\/b>. \u0414\u0440\u0443\u0433\u0438\u043c\u0438 \u0441\u043b\u043e\u0432\u0430\u043c\u0438, \u0432\u044b \u043a\u043e\u0435 \u0433\u0434\u0435 \u0434\u043e\u043b\u0436\u043d\u044b \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u043a\u0440\u0443\u0433\u043b\u044b\u0435 \u0441\u043a\u043e\u0431\u043a\u0438 \u0432\u043e\u043a\u0440\u0443\u0433 \u0431\u0438\u043d\u0430\u0440\u043d\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439. \u041f\u0440\u0438 \u044d\u0442\u043e\u043c \u043f\u043e\u0441\u0442\u0430\u0440\u0430\u0439\u0442\u0435\u0441\u044c \u043c\u0438\u043d\u0438\u043c\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043a\u0440\u0443\u0433\u043b\u044b\u0445 \u0441\u043a\u043e\u0431\u043e\u043a \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u044d\u0442\u043e \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e (\u043d\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0434\u043e\u043b\u0436\u0435\u043d \u0431\u044b\u0442\u044c \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u044b\u043c). \u041f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u0442\u0435 \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u0437\u0430\u0434\u0430\u043d\u0438\u0435, \u0435\u0441\u043b\u0438 \u0432\u044b \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0445\u043e\u0442\u0438\u0442\u0435 \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u044d\u0442\u043e \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e.<\/li>\n<\/ul>\n<\/blockquote>\n<p>\u041f\u043e \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0438 \u0441 \u043f\u0430\u0440\u043e\u0439 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0434\u043b\u044f \u00a0<strong><span style=\"color: #0000ff;\">evaluate<\/span><\/strong><\/p>\n<p><strong><span style=\"color: #0000ff;\">private func evaluate(ops: [Op]) -&gt; (result: Double?, remainingOps: [Op])<\/span><\/strong><br \/>\n<strong><span style=\"color: #0000ff;\">func evaluate() -&gt; Double?<\/span><\/strong><\/p>\n<p>\u0441\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u0434\u043b\u044f\u00a0<strong><span style=\"color: #0000ff;\">description<\/span><\/strong>\u00a0\u0432\u0441\u043f\u043e\u043c\u043e\u0433\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0439\u00a0<strong>private<\/strong>\u00a0\u043c\u0435\u0442\u043e\u0434 \u0438<strong>\u00a0non-private<\/strong>\u00a0\u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e<\/p>\n<p><strong><span style=\"color: #0000ff;\">private func description(ops: [Op]) -&gt; (result: String?, remainingOps: [Op])<\/span><\/strong><br \/>\n<strong><span style=\"color: #0000ff;\">var description: String<\/span><\/strong><\/p>\n<p>\u0412\u0441\u043f\u043e\u043c\u043e\u0433\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434\u00a0<strong><span style=\"color: #0000ff;\">private func description<\/span><\/strong><span style=\"color: #0000ff;\"><span style=\"color: #000000;\">\u00a0\u043d\u0430\u0447\u0438\u043d\u0430\u0435\u0442 \u0441 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430 \u0441\u0442\u044d\u043a\u0430 \u0438 \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0440\u0435\u043a\u0443\u0440\u0441\u0438\u0432\u043d\u043e<\/span><\/span>. \u0414\u043b\u044f \u043e\u043f\u0435\u0440\u0430\u043d\u0434\u043e\u0432 \u043c\u044b \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435, \u043e\u0442\u0444\u043e\u0440\u043c\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0435 \u0443\u0436\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u044b\u043c \u043d\u0430\u043c \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u0435\u0441\u043a\u0438\u043c\u00a0<strong><span style=\"color: #0000ff;\">numberFormatter ()<\/span><\/strong>. \u0414\u043b\u044f\u00a0<strong>\u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439-\u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442<\/strong>\u00a0\u2013 \u0432 \u043d\u0430\u0448\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435\u00a0<strong><span style=\"color: #0000ff;\">\u03c0<\/span><\/strong>\u00a0\u2013 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c \u0441\u0438\u043c\u0432\u043e\u043b \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u044b\u00a0<strong><span style=\"color: #0000ff;\">symbol<\/span><\/strong>. \u0414\u043b\u044f<strong>\u00a0\u0443\u043d\u0430\u0440\u043d\u043e\u0439 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438<\/strong>\u00a0\u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c \u0441\u0438\u043c\u0432\u043e\u043b \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u044b\u00a0<strong><span style=\"color: #0000ff;\">symbol<\/span>\u00a0<\/strong>\u0441\u00a0<strong>\u043e\u043f\u0435\u0440\u0430\u043d\u0434\u043e\u043c<\/strong>, \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u043d\u043e\u043c\u00a0<strong>\u043a\u0440\u0443\u0433\u043b\u044b\u043c\u0438 \u0441\u043a\u043e\u0431\u043a\u0430\u043c\u0438<\/strong>. \u0414\u043b\u044f\u00a0<strong>\u0431\u0438\u043d\u0430\u0440\u043d\u043e\u0439 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438<\/strong>\u00a0\u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c \u043e\u043f\u0435\u0440\u0430\u043d\u0434\u044b, \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u043d\u044b\u0435 \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u043c \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438\u00a0<strong><span style=\"color: #0000ff;\">symbol<\/span><\/strong>. \u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, \u043c\u044b \u0437\u0430\u043a\u043b\u044e\u0447\u0430\u0435\u043c \u0432\u00a0<strong>\u043a\u0440\u0443\u0433\u043b\u044b\u0435 \u0441\u043a\u043e\u0431\u043a\u0438<\/strong>\u00a0<strong>\u043f\u0435\u0440\u0432\u044b\u0439 \u043e\u043f\u0435\u0440\u0430\u043d\u0434<\/strong>, \u0435\u0441\u043b\u0438 \u043e\u0441\u0442\u0430\u0432\u0448\u0438\u0439\u0441\u044f \u0441\u0442\u044d\u043a \u0441\u043e\u0441\u0442\u043e\u0438\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u0438\u0437 \u043e\u0434\u043d\u043e\u0433\u043e \u0438\u043b\u0438 \u0434\u0432\u0443\u0445 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432. \u0414\u043b\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c \u0435\u0435\u00a0<strong><span style=\"color: #0000ff;\">symbol<\/span><\/strong>. \u0415\u0441\u043b\u0438 \u0441\u0442\u044d\u043a \u043d\u0435 \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u0430\u043b\u0441\u044f, \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c \u0437\u043d\u0430\u043a\u00a0<strong><span style=\"color: #0000ff;\">?<\/span><\/strong>\u00a0\u0432\u043e\u043f\u0440\u043e\u0441\u0430.<\/p>\n<p><a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-23-at-10.17.56-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-2731 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-23-at-10.17.56-PM.png\" alt=\"Screen Shot 2015-08-23 at 10.17.56 PM\" width=\"1234\" height=\"950\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-23-at-10.17.56-PM.png 1234w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-23-at-10.17.56-PM-300x231.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-23-at-10.17.56-PM-1024x788.png 1024w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-23-at-10.17.56-PM-390x300.png 390w\" sizes=\"auto, (max-width: 1234px) 100vw, 1234px\" \/><\/a><br \/>\n\u0414\u043b\u044f \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043e\u043f\u0435\u0440\u0430\u043d\u0434\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d \u043a\u043b\u0430\u0441\u0441 <strong><span style=\"color: #0000ff;\">NumberFormatter<\/span><\/strong> \u0434\u043b\u044f \u0444\u043e\u0440\u043c\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0434\u0435\u0441\u044f\u0442\u0438\u0447\u043d\u044b\u0445 \u0447\u0438\u0441\u0435\u043b \u0438 \u0440\u0430\u0437\u0434\u0435\u043b\u044f\u0435\u043c\u0430\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f (<strong>singleton<\/strong>) <strong><span style=\"color: #0000ff;\">formatter<\/span><\/strong>.<br \/>\n<a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-23-at-10.28.48-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-2732 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-23-at-10.28.48-PM.png\" alt=\"Screen Shot 2015-08-23 at 10.28.48 PM\" width=\"984\" height=\"378\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-23-at-10.28.48-PM.png 984w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-23-at-10.28.48-PM-300x115.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-23-at-10.28.48-PM-500x192.png 500w\" sizes=\"auto, (max-width: 984px) 100vw, 984px\" \/><\/a><br \/>\n\u0415\u0441\u043b\u0438 \u0432 \u0441\u0442\u044d\u043a\u0435 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0437\u0430\u043a\u043e\u043d\u0447\u0435\u043d\u043d\u044b\u0445 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0439, \u0438\u0445 \u043d\u0443\u0436\u043d\u043e \u0440\u0430\u0437\u0434\u0435\u043b\u0438\u0442\u044c \u0437\u0430\u043f\u044f\u0442\u044b\u043c\u0438.<br \/>\n\u0412 \u0417\u0430\u0434\u0430\u043d\u0438\u0438 2 \u0434\u0430\u043d\u0430 \u043f\u043e\u0434\u0441\u043a\u0430\u0437\u043a\u0430 \u2116 8:<br \/>\n\u201c\u0415\u0441\u043b\u0438 \u0432 \u0441\u0442\u044d\u043a\u0435 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0437\u0430\u043a\u043e\u043d\u0447\u0435\u043d\u043d\u044b\u0445 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0439, \u0440\u0430\u0437\u0434\u0435\u043b\u044f\u0435\u043c \u0438\u0445 \u0437\u0430\u043f\u044f\u0442\u044b\u043c\u0438\u201d. \u042d\u0442\u0443 \u0447\u0430\u0441\u0442\u044c \u0434\u043b\u044f\u00a0<b><span style=\"color: #0000ff;\">description<\/span><\/b>\u00a0\u043b\u0443\u0447\u0448\u0435 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u00a0\u0432\u043d\u0443\u0442\u0440\u0438 \u043a\u043e\u0434\u0430 \u0434\u043b\u044f \u00a0<span style=\"color: #0000ff;\"><b>var<\/b>\u00a0<b>description<\/b><\/span>\u00a0( \u0430 \u043d\u0435 \u0432 \u0435\u0433\u043e \u0440\u0435\u043a\u0443\u0440\u0441\u0438\u0432\u043d\u043e\u043c \u0432\u0441\u043f\u043e\u043c\u043e\u0433\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0438 \u043c\u0435\u0442\u043e\u0434\u0435).<\/p>\n<p>\u0417\u0434\u0435\u0441\u044c \u0435\u0441\u0442\u044c \u0434\u0432\u0430 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u0430.<br \/>\n\u041f\u0435\u0440\u0432\u044b\u0439 \u0431\u043e\u043b\u0435\u0435 \u043f\u0440\u043e\u0441\u0442\u043e\u0439 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u044e\u00a0<strong><span style=\"color: #0000ff;\">do&#8230;while \u00a0<\/span><\/strong>\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0432<strong><span style=\"color: #0000ff;\">\u00a0get{}<\/span><\/strong>\u00a0\u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 \u00a0<span style=\"color: #0000ff;\"><b>var<\/b>\u00a0<b>description<\/b><\/span><br \/>\n<a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.05.04-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-1607 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.05.04-PM.png\" alt=\"Screen Shot 2015-03-27 at 5.05.04 PM\" width=\"1096\" height=\"300\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.05.04-PM.png 1096w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.05.04-PM-300x82.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.05.04-PM-1024x280.png 1024w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.05.04-PM-500x137.png 500w\" sizes=\"auto, (max-width: 1096px) 100vw, 1096px\" \/><\/a><br \/>\n\u0412\u0442\u043e\u0440\u043e\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u0441\u0432\u044f\u0437\u0430\u043d \u0441 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435\u043c \u0435\u0449\u0435 \u043e\u0434\u043d\u043e\u0439 \u0432\u0441\u043f\u043e\u043c\u043e\u0433\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u0431\u043e\u043b\u0435\u0435 \u0432\u044b\u0441\u043e\u043a\u043e\u0433\u043e \u0440\u0430\u043d\u0433\u0430 \u0440\u0435\u043a\u0443\u0440\u0435\u043d\u0442\u043d\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438\u00a0<strong><span style=\"color: #0000ff;\">descParts<\/span><\/strong>, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u0434\u0435\u043b\u044f\u0442\u044c \u0438 \u0440\u0430\u0437\u0434\u0435\u043b\u044f\u0442\u044c \u0437\u0430\u043f\u044f\u0442\u043e\u0439 \u0437\u0430\u043a\u043e\u043d\u0447\u0435\u043d\u043d\u044b\u0435 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044f, \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u044b\u0435 \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0440\u0435\u043a\u0443\u0440\u0435\u043d\u0442\u043d\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438\u00a0<strong><span style=\"color: #0000ff;\">description\u00a0<\/span><\/strong><br \/>\n<a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.12.31-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-1609 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.12.31-PM.png\" alt=\"Screen Shot 2015-03-27 at 5.12.31 PM\" width=\"1018\" height=\"226\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.12.31-PM.png 1018w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.12.31-PM-300x67.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.12.31-PM-500x111.png 500w\" sizes=\"auto, (max-width: 1018px) 100vw, 1018px\" \/><\/a><br \/>\n\u0438 \u00a0\u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 \u00a0<span style=\"color: #0000ff;\"><b>var<\/b>\u00a0<b>description1<\/b><span style=\"color: #000000;\">, \u0447\u0435\u0439\u00a0<strong><span style=\"color: #0000ff;\">get{}<\/span>\u00a0<\/strong>\u0430\u0431\u0441\u043e\u043b\u044e\u0442\u043d\u0430\u044f \u043a\u0430\u043b\u044c\u043a\u0430 \u0441\u00a0<strong><span style=\"color: #0000ff;\">evaluate()<\/span><\/strong><\/span><\/span><br \/>\n<a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.33.14-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-1611 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.33.14-PM.png\" alt=\"Screen Shot 2015-03-27 at 5.33.14 PM\" width=\"992\" height=\"190\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.33.14-PM.png 992w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.33.14-PM-300x57.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-27-at-5.33.14-PM-500x96.png 500w\" sizes=\"auto, (max-width: 992px) 100vw, 992px\" \/><\/a><br \/>\n\u0412 \u043d\u0430\u0448\u0435\u043c \u043a\u043b\u0430\u0441\u0441\u0435\u00a0<strong><span style=\"color: #0000ff;\">ViewController<\/span><\/strong>\u00a0\u0432\u00a0<strong><span style=\"color: #0000ff;\">set {}<\/span><\/strong>\u00a0\u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u043c\u043e\u0439 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439\u00a0<strong><span style=\"color: #0000ff;\">displaValue<\/span><\/strong>, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0430 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0439, \u043c\u044b \u043c\u0435\u0442\u043a\u0443\u00a0<strong><span style=\"color: #0000ff;\">history<\/span><\/strong>\u00a0\u043c\u043e\u0436\u0435\u043c \u043d\u0430\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0434\u0440\u0443\u0433\u0438\u043c \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435\u043c, \u043f\u0440\u043e\u0441\u0442\u043e \u0437\u0430\u043c\u0435\u043d\u0438\u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0432\u044b\u0437\u043e\u0432\u0430\u00a0<strong><span style=\"color: #0000ff;\">brain.displayStack()<\/span><\/strong>\u00a0\u043d\u0430<strong><span style=\"color: #0000ff;\">\u00a0brain.description<\/span><\/strong>\u00a0\u0438\u043b\u0438<strong><span style=\"color: #0000ff;\">\u00a0brain.description1<\/span><\/strong><span style=\"color: #0000ff;\">.<\/span><\/p>\n<p><a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-2738 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM.png\" alt=\"Screen Shot 2015-08-24 at 6.38.10 AM\" width=\"1164\" height=\"588\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM.png 1164w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM-300x152.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM-1024x517.png 1024w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM-500x253.png 500w\" sizes=\"auto, (max-width: 1164px) 100vw, 1164px\" \/><\/a><\/p>\n<p>\u042f \u043e\u0441\u0442\u0430\u0432\u0438\u043b\u0430 c \u043e\u0431\u0443\u0447\u0430\u044e\u0449\u0435\u0439 \u0446\u0435\u043b\u044c\u044e \u0432 \u043a\u043e\u0434\u0435 \u043a\u0430\u043a <strong><span style=\"color: #0000ff;\">description<\/span><\/strong>, \u0442\u0430\u043a \u0438 <strong><span style=\"color: #0000ff;\">description1<\/span><\/strong><span style=\"color: #0000ff;\"><span style=\"color: #000000;\">.<\/span><\/span><\/p>\n<p>\u0414\u043b\u044f \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u0440\u0430\u0437\u043c\u0435\u0441\u0442\u0438\u0442\u044c \u0442\u0435\u0441\u0442\u044b \u0432 \u0444\u0430\u0439\u043b\u0435\u00a0<strong>CalculatorBrainTests<\/strong>\u00a0\u0438 \u0432\u043c\u0435\u0441\u0442\u043e \u0437\u0430\u043f\u0443\u0441\u043a\u0430 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u043a\u043d\u043e\u043f\u043a\u043e\u0439\u00a0<strong>Run<\/strong>, \u043d\u0443\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u00a0<strong>Test<\/strong><\/p>\n<p><a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-8.57.18-AM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-2751 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-8.57.18-AM.png\" alt=\"Screen Shot 2015-08-24 at 8.57.18 AM\" width=\"1140\" height=\"1004\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-8.57.18-AM.png 1140w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-8.57.18-AM-300x264.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-8.57.18-AM-1024x902.png 1024w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-8.57.18-AM-341x300.png 341w\" sizes=\"auto, (max-width: 1140px) 100vw, 1140px\" \/><\/a><\/p>\n<p>\u0414\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043d\u043e\u0432\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0441\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u0440\u044f\u0434 \u0442\u0435\u0441\u0442\u043e\u0432\u044b\u0445 \u0441\u043b\u0443\u0447\u0430\u0435\u0432 \u0432 \u0444\u0430\u0439\u043b\u0435 <strong>CalculatorBrainTests<\/strong>:<\/p>\n<p>[objc]<br \/>\nclass CalculatorBrainTests: XCTestCase {<br \/>\n     private var brain = CalculatorBrain()<\/p>\n<p>    func testPushOperandVariable() {<br \/>\n        XCTAssertNil(brain.pushOperand(&quot;x&quot;))<br \/>\n        brain.variableValues = [&quot;x&quot;: 5.2]<br \/>\n        XCTAssertEqual(5.2, brain.pushOperand(&quot;x&quot;)!)<br \/>\n        XCTAssertEqual(10.4, brain.performOperation(&quot;+&quot;)!)<br \/>\n    }<\/p>\n<p>    func testDescription() {<br \/>\n        \/\/ cos(10)<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertEqual(brain.pushOperand(10)!, 10)<br \/>\n        XCTAssertTrue(brain.performOperation(&quot;cos&quot;)! &#8212; 0.839 &lt; 0.1)<br \/>\n        XCTAssertEqual(brain.displayStack(), &quot;10.0 cos&quot;)<\/p>\n<p>        \/\/ 3 &#8212; 5<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertEqual(brain.pushOperand(3)!, 3)<br \/>\n        XCTAssertEqual(brain.pushOperand(5)!, 5)<br \/>\n        XCTAssertEqual(brain.performOperation(&quot;\u2212&quot;)!, -2)<br \/>\n        XCTAssertEqual(brain.description, &quot;3 \u2212 5&quot;)<\/p>\n<p>        \/\/ 23.5<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertEqual(brain.pushOperand(23.5)!, 23.5)<br \/>\n        XCTAssertEqual(brain.description, &quot;23.5&quot;)<\/p>\n<p>        \/\/ \u03c0<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertEqual(brain.performOperation(&quot;\u03c0&quot;)!, M_PI)<br \/>\n        XCTAssertEqual(brain.description, &quot;\u03c0&quot;)<\/p>\n<p>        \/\/ x<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertNil(brain.pushOperand(&quot;x&quot;))<br \/>\n        XCTAssertEqual(brain.description, &quot;x&quot;)<\/p>\n<p>        \/\/ \u221a(10) + 3<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertEqual(brain.pushOperand(10)!, 10)<br \/>\n        XCTAssertTrue(brain.performOperation(&quot;\u221a&quot;)! &#8212; 3.162 &lt; 0.1)<br \/>\n        XCTAssertEqual(brain.pushOperand(3)!, 3)<br \/>\n        XCTAssertTrue(brain.performOperation(&quot;+&quot;)! &#8212; 6.162 &lt; 0.1)<br \/>\n        XCTAssertEqual(brain.description, &quot;\u221a(10) + 3&quot;)<\/p>\n<p>        \/\/ \u221a(3 + 5)<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertEqual(brain.pushOperand(3)!, 3)<br \/>\n        XCTAssertEqual(brain.pushOperand(5)!, 5)<br \/>\n        XCTAssertEqual(brain.performOperation(&quot;+&quot;)!, 8)<br \/>\n        XCTAssertTrue(brain.performOperation(&quot;\u221a&quot;)! &#8212; 2.828 &lt; 0.1)<br \/>\n        XCTAssertEqual(brain.description, &quot;\u221a(3 + 5)&quot;)<\/p>\n<p>        \/\/ 3 + (5 + 4)<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertEqual(brain.pushOperand(3)!, 3)<br \/>\n        XCTAssertEqual(brain.pushOperand(5)!, 5)<br \/>\n        XCTAssertEqual(brain.pushOperand(4)!, 4)<br \/>\n        XCTAssertEqual(brain.performOperation(&quot;+&quot;)!, 9)<br \/>\n        XCTAssertEqual(brain.performOperation(&quot;+&quot;)!, 12)<br \/>\n        XCTAssertEqual(brain.description, &quot;3 + (5 + 4)&quot;)<\/p>\n<p>        \/\/ \u221a(3 + \u221a(5)) \u00f7 6<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertEqual(brain.pushOperand(3)!, 3)<br \/>\n        XCTAssertEqual(brain.pushOperand(5)!, 5)<br \/>\n        XCTAssertTrue(brain.performOperation(&quot;\u221a&quot;)! &#8212; 2.236 &lt; 0.1)<br \/>\n        XCTAssertTrue(brain.performOperation(&quot;+&quot;)! &#8212; 5.236 &lt; 0.1)<br \/>\n        XCTAssertTrue(brain.performOperation(&quot;\u221a&quot;)! &#8212; 2.288 &lt; 0.1)<br \/>\n        XCTAssertEqual(brain.pushOperand(6)!, 6)<br \/>\n        XCTAssertTrue(brain.performOperation(&quot;\u00f7&quot;)! &#8212; 0.381 &lt; 0.1)<br \/>\n        XCTAssertEqual(brain.description, &quot;\u221a(3 + \u221a(5)) \u00f7 6&quot;)<\/p>\n<p>        \/\/ ? + 3<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertEqual(brain.pushOperand(3)!, 3)<br \/>\n        XCTAssertNil(brain.performOperation(&quot;+&quot;))<br \/>\n        XCTAssertEqual(brain.description, &quot;? + 3&quot;)<\/p>\n<p>        \/\/ \u221a(3 + 5), cos(\u03c0)<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertEqual(brain.pushOperand(3)!, 3)<br \/>\n        XCTAssertEqual(brain.pushOperand(5)!, 5)<br \/>\n        XCTAssertEqual(brain.performOperation(&quot;+&quot;)!, 8)<br \/>\n        XCTAssertTrue(brain.performOperation(&quot;\u221a&quot;)! &#8212; 2.828 &lt; 0.1)<br \/>\n        XCTAssertEqual(brain.performOperation(&quot;\u03c0&quot;)!, M_PI)<br \/>\n        XCTAssertEqual(brain.performOperation(&quot;cos&quot;)!, -1)<br \/>\n        XCTAssertEqual(brain.description, &quot;\u221a(3 + 5), cos(\u03c0)&quot;)<\/p>\n<p>        \/\/ 3 * (5 + 4)<br \/>\n        brain = CalculatorBrain()<br \/>\n        XCTAssertEqual(brain.pushOperand(3)!, 3)<br \/>\n        XCTAssertEqual(brain.pushOperand(5)!, 5)<br \/>\n        XCTAssertEqual(brain.pushOperand(4)!, 4)<br \/>\n        XCTAssertEqual(brain.performOperation(&quot;+&quot;)!, 9)<br \/>\n        XCTAssertEqual(brain.performOperation(&quot;\u00d7&quot;)!, 27)<br \/>\n        XCTAssertEqual(brain.description, &quot;3 \u00d7 (5 + 4)&quot;)<br \/>\n    }<br \/>\n}<br \/>\n[\/objc]<\/p>\n<p>\u041a\u043e\u0434 \u043c\u043e\u0436\u043d\u043e \u0441\u043a\u0430\u0447\u0430\u0442\u044c \u043d\u0430\u00a0<a href=\"https:\/\/github.com\/BestKora\/Calculator-cs193p-Winter-2015-Assigment-2\/tree\/Required7-8Correct\"><strong>Github<\/strong>.<\/a><\/p>\n<h2>\u041f\u0443\u043d\u043a\u0442 8 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0439<\/h2>\n<blockquote><p><strong>\u041c\u043e\u0434\u0438\u0444\u0438\u0446\u0438\u0440\u0443\u0439\u0442\u0435 \u043c\u0435\u0442\u043a\u0443<span style=\"color: #0000ff;\">\u00a0UILabel<\/span>, \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u0432\u044b \u0434\u043e\u0431\u0430\u0432\u0438\u043b\u0438 \u043d\u0430 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 \u043d\u0435\u0434\u0435\u043b\u0435, \u0447\u0442\u043e\u0431\u044b \u043e\u043d\u0430 \u043f\u043e\u043a\u0430\u0437\u044b\u0432\u0430\u043b\u0430 description \u00a0\u0432\u0430\u0448\u0435\u0433\u043e \u00a0<span style=\"color: #0000ff;\">CalculatorBrain<\/span>. \u0412 \u043a\u043e\u043d\u0446\u0435 \u0440\u0430\u0437\u043c\u0435\u0441\u0442\u0438\u0442\u0435 \u0437\u043d\u0430\u043a \u201c<span style=\"color: #0000ff;\">=<\/span>\u201d \u0438 \u0440\u0430\u0437\u043c\u0435\u0441\u0442\u0438\u0442\u0435 \u043c\u0435\u0442\u043a\u0443\u00a0<span style=\"color: #0000ff;\">UILabel<\/span>\u00a0\u0442\u0430\u043a, \u0447\u0442\u043e\u0431\u044b \u0434\u0438\u0441\u043f\u043b\u0435\u0439 \u0432\u044b\u0433\u043b\u044f\u0434\u0435\u043b \u043a\u0430\u043a \u0431\u0443\u0434\u0442\u043e \u0431\u044b \u043e\u043d \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u043e\u043c \u044d\u0442\u043e\u0433\u043e \u201c<span style=\"color: #0000ff;\">=<\/span>\u201d . \u042d\u0442\u043e \u0437\u043d\u0430\u043a \u201c<span style=\"color: #0000ff;\">=<\/span>\u201d \u0431\u044b\u043b \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u043f\u0443\u043d\u043a\u0442\u043e\u043c \u0437\u0430\u0434\u0430\u043d\u0438\u044f \u043d\u0430 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 \u043d\u0435\u0434\u0435\u043b\u0435, \u043d\u043e \u0441\u0435\u0439\u0447\u0430\u0441 \u044d\u0442\u043e \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u043f\u0443\u043d\u043a\u0442.<\/strong><\/p><\/blockquote>\n<p>\u042d\u0442\u043e\u0442 \u043f\u0443\u043d\u043a\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d \u043d\u0430\u043c\u0438 \u0432 \u0417\u0430\u0434\u0430\u043d\u0438\u0438 1 \u043a\u0430\u043a \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439. \u041d\u0430\u043f\u043e\u043c\u043d\u0438\u043c, \u0447\u0442\u043e \u043c\u044b \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u0435\u043c \u0437\u043d\u0430\u043a &#171;<strong>=<\/strong>&#187; \u043f\u0440\u0438 \u043d\u0430\u0436\u0430\u0442\u0438\u0438 \u043b\u044e\u0431\u043e\u0439 \u043a\u043d\u043e\u043f\u043a\u0438 \u0441 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0435\u0439 \u0438 \u0443\u0441\u043f\u0435\u0448\u043d\u043e\u0433\u043e \u0435\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f (\u043d\u0435 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442\u0441\u044f <strong><span style=\"color: #0000ff;\">nil)<\/span><\/strong> \u0438 \u0441\u0442\u0440\u043e\u043a\u0443 &#171;<strong> = Error<\/strong>&#187; \u0432 \u0441\u043b\u0443\u0447\u0430\u0435 \u0430\u0432\u0430\u0440\u0438\u0439\u043d\u043e\u0433\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u0438\u043b\u0438 \u043d\u0435\u0445\u0432\u0430\u0442\u043a\u0438 \u043e\u043f\u0435\u0440\u0430\u043d\u0434\u043e\u0432.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-22-at-10.08.59-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-2723 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-22-at-10.08.59-PM.png\" alt=\"Screen Shot 2015-08-22 at 10.08.59 PM\" width=\"988\" height=\"406\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-22-at-10.08.59-PM.png 988w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-22-at-10.08.59-PM-300x123.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-22-at-10.08.59-PM-500x205.png 500w\" sizes=\"auto, (max-width: 988px) 100vw, 988px\" \/><\/a><\/p>\n<p>\u0412\u00a0<strong><span style=\"color: #0000ff;\">set {}<\/span><\/strong>\u00a0\u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u043c\u043e\u0439 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439\u00a0<strong><span style=\"color: #0000ff;\">displaValue\u00a0<\/span><\/strong>\u043c\u044b \u043a\u0430\u0436\u0434\u044b\u0439 \u0440\u0430\u0437 \u0437\u0430\u043d\u043e\u0432\u043e \u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u043c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043c\u0435\u0442\u043a\u0438\u00a0<strong><span style=\"color: #0000ff;\">history<\/span><\/strong>\u00a0\u0438 \u043d\u0430\u043f\u043e\u043b\u043d\u044f\u0435\u043c \u0435\u0435 \u0434\u0440\u0443\u0433\u0438\u043c \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435\u043c , \u043f\u0440\u043e\u0441\u0442\u043e \u0437\u0430\u043c\u0435\u043d\u0438\u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0432\u044b\u0437\u043e\u0432\u0430\u00a0<strong><span style=\"color: #0000ff;\">brain.displayStack()<\/span><\/strong>\u00a0\u043d\u0430<strong><span style=\"color: #0000ff;\">\u00a0brain.description<\/span><\/strong>\u00a0\u0438\u043b\u0438<strong><span style=\"color: #0000ff;\">\u00a0brain.description1<\/span><\/strong><span style=\"color: #0000ff;\">.<\/span><span style=\"color: #0000ff;\"><span style=\"color: #000000;\">(\u0441\u043c\u043e\u0442\u0440\u0438 \u041f\u0443\u043d\u043a\u0442 7 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0439).<\/span><\/span><\/p>\n<p><a href=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-2738 size-full\" src=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM.png\" alt=\"Screen Shot 2015-08-24 at 6.38.10 AM\" width=\"1164\" height=\"588\" srcset=\"https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM.png 1164w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM-300x152.png 300w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM-1024x517.png 1024w, https:\/\/bestkora.com\/IosDeveloper\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-24-at-6.38.10-AM-500x253.png 500w\" sizes=\"auto, (max-width: 1164px) 100vw, 1164px\" \/><\/a><br \/>\n\u041a\u043e\u0434 \u0434\u043b\u044f\u00a0<strong>Swift 1.2<\/strong>\u00a0 \u0438\u00a0<strong>iOS 8<\/strong>\u00a0\u043c\u043e\u0436\u043d\u043e \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u043d\u0430\u00a0<strong><a href=\"https:\/\/github.com\/BestKora\/Calculator-cs193p-Winter-2015-Assigment-2\/tree\/Required7-8Correct\">Github<\/a><\/strong>.<\/p>\n<p>\u041a\u043e\u0434 \u0434\u043b\u044f\u00a0<strong>Swift 2.0<\/strong>\u00a0\u00a0\u0438\u00a0<strong>iOS 9<\/strong>\u00a0\u043c\u043e\u0436\u043d\u043e \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u043d\u0430\u00a0<strong><a href=\"https:\/\/github.com\/BestKora\/CalculatorBrain-Assignment-2-iOS-9\">Github<\/a><\/strong>.<br \/>\n\u041f\u0440\u043e\u0434\u043e\u043b\u0436\u0435\u043d\u0438\u0435 \u0441\u043b\u0435\u0434\u0443\u0435\u0442&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0422\u0435\u043a\u0441\u0442 \u0414\u043e\u043c\u0430\u0448\u043d\u0435\u0433\u043e \u0437\u0430\u0434\u0430\u043d\u0438\u044f \u043d\u0430 \u0430\u043d\u0433\u043b\u0438\u0439\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043d\u0430\u00a0\u00a0iTunes \u0432 \u043f\u0443\u043d\u043a\u0442\u0435 \u201cDeveloping iOS 8 app: Programming: Project 2\u2033. \u00a0\u0422\u0435\u043a\u0441\u0442 \u0414\u043e\u043c\u0430\u0448\u043d\u0435\u0433\u043e \u0437\u0430\u0434\u0430\u043d\u0438\u044f \u043d\u0430\u00a0\u0440\u0443\u0441\u0441\u043a\u043e\u043c\u00a0\u00a0\u044f\u0437\u044b\u043a\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043d\u0430 \u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0437\u0430\u0434\u0430\u043d\u0438\u044f \u043c\u043e\u0436\u043d\u043e \u043e\u0431\u0441\u0443\u0436\u0434\u0430\u0442\u044c \u043d\u0430 \u0444\u043e\u0440\u0443\u043c\u0435\u00a0Swift[ru]\u00a0. \u0412\u0430\u0448\u0435 \u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043b\u0443\u0447\u0448\u0435 \u0438 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u0435\u0435. \u0412\u044b\u043a\u043b\u0430\u0434\u044b\u0432\u0430\u0439\u0442\u0435 \u0435\u0433\u043e \u0432\u00a0Github,\u00a0\u0434\u0430\u0432\u0430\u0439\u0442\u0435 &hellip; <a href=\"https:\/\/bestkora.com\/IosDeveloper\/zadanie-2-reshenie-prodolzhenie-obyazatelnye-punkty-5-8-swift-1-2-i-swift-2-0\/\">\u0427\u0438\u0442\u0430\u0442\u044c \u0434\u0430\u043b\u0435\u0435 <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,23,14,4],"tags":[30,26],"class_list":["post-2728","post","type-post","status-publish","format-standard","hentry","category-ios-8","category-stanford-cs-193p-ios-8","category-swift","category-domashnee-zadanie","tag-domashnee-zadanie","tag-zadanie-ios-8"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u0440\u0435\u0448\u0435\u043d\u0438\u044f \u0417\u0430\u0434\u0430\u043d\u0438\u044f 2 &quot;\u0423\u043c\u043d\u044b\u0439 \u043a\u0430\u043b\u044c\u043a\u0443\u043b\u044f\u0442\u043e\u0440&quot; \u0441\u0442\u044d\u043d\u0444\u043e\u0440\u0434\u0441\u043a\u0438\u0445 \u043a\u0443\u0440\u0441\u043e\u0432 &quot;\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0430 iOS 8 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043d\u0430 Swift&quot;\" \/>\n\t<meta name=\"robots\" content=\"max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n\t<meta name=\"author\" content=\"tatiana.kornilova@gmail.com\"\/>\n\t<meta name=\"keywords\" content=\"ios 8,stanford cs193p ios 8,swift,xcode,\u0441\u0442\u044d\u043d\u0444\u043e\u0440\u0434\u0441\u043a\u0438\u0435 \u043b\u0435\u043a\u0446\u0438\u0438,\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u043e\u0434 ios,ios programming,\u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0430 ios 8 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