Realize all the calculator function, debugging error-free, novice learning good code

UI_Calculator
.............\UI_Calculator
.............\.............\AppDelegate.h
__MACOSX
........\UI_Calculator
........\.............\UI_Calculator
........\.............\.............\._AppDelegate.h
UI_Calculator\UI_Calculator\AppDelegate.m
__MACOSX\UI_Calculator\UI_Calculator\._AppDelegate.m
UI_Calculator\UI_Calculator\CalculatorView.h
__MACOSX\UI_Calculator\UI_Calculator\._CalculatorView.h
UI_Calculator\UI_Calculator\CalculatorView.m
__MACOSX\UI_Calculator\UI_Calculator\._CalculatorView.m
UI_Calculator\UI_Calculator\CalculatorView.xib
.............\.............\en.lproj
.............\.............\........\InfoPlist.strings
__MACOSX\UI_Calculator\UI_Calculator\en.lproj
........\.............\.............\........\._InfoPlist.strings
UI_Calculator\UI_Calculator\Images.xcassets
.............\.............\...............\AppIcon.appiconset
.............\.............\...............\..................\Contents.json
__MACOSX\UI_Calculator\UI_Calculator\Images.xcassets
........\.............\.............\...............\AppIcon.appiconset
........\.............\.............\...............\..................\._Contents.json
UI_Calculator\UI_Calculator\Images.xcassets\LaunchImage.launchimage
.............\.............\...............\.......................\Contents.json
__MACOSX\UI_Calculator\UI_Calculator\Images.xcassets\LaunchImage.launchimage
........\.............\.............\...............\.......................\._Contents.json
UI_Calculator\UI_Calculator\main.m
__MACOSX\UI_Calculator\UI_Calculator\._main.m
UI_Calculator\UI_Calculator\test.xib
.............\.............\UI_Calculator-Info.plist
.............\.............\UI_Calculator-Prefix.pch
__MACOSX\UI_Calculator\UI_Calculator\._UI_Calculator-Prefix.pch
UI_Calculator\UI_Calculator.xcodeproj
.............\.......................\project.pbxproj
.............\.......................\project.xcworkspace
.............\.......................\...................\contents.xcworkspacedata
.............\.......................\...................\xcuserdata
.............\.......................\...................\..........\xiajianjie.xcuserdatad
.............\.......................\...................\..........\......................\UserInterfaceState.xcuserstate
.............\.......................\xcuserdata
.............\.......................\..........\xiajianjie.xcuserdatad
.............\.......................\..........\......................\xcdebugger
.............\.......................\..........\......................\..........\Breakpoints_v2.xcbkptlist
.............\.......................\..........\......................\xcschemes
.............\.......................\..........\......................\.........\UI_Calculator.xcscheme
.............\.......................\..........\......................\.........\xcschememanagement.plist
.............\UI_CalculatorTests
.............\..................\en.lproj
.............\..................\........\InfoPlist.strings
__MACOSX\UI_Calculator\UI_CalculatorTests
........\.............\..................\en.lproj
........\.............\..................\........\._InfoPlist.strings
UI_Calculator\UI_CalculatorTests\UI_CalculatorTests-Info.plist
.............\..................\UI_CalculatorTests.m
__MACOSX\UI_Calculator\UI_CalculatorTests\._UI_CalculatorTests.m

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