The example is objective-c language, xcode platform developed calculator program, to just start learning objective-c language, newcomers, there are still some help.

Exam3
.....\build
.....\.....\.DS_Store
__MACOSX
........\Exam3
........\.....\build
........\.....\.....\._.DS_Store
Exam3\build\Debug
.....\.....\.....\Exam3.app
.....\.....\.....\.........\Contents
.....\.....\.....\.........\........\Info.plist
.....\.....\.....\.........\........\MacOS
.....\.....\.....\.........\........\.....\Exam3
.....\.....\.....\.........\........\PkgInfo
.....\.....\.....\.........\........\Resources
.....\.....\.....\.........\........\.........\English.lproj
.....\.....\.....\.........\........\.........\.............\InfoPlist.strings
.....\.....\.....\.........\........\.........\.............\MainMenu.nib
.....\.....\Exam3.build
.....\.....\...........\Debug
.....\.....\...........\.....\Exam3.build
.....\.....\...........\.....\...........\Exam3-all-target-headers.hmap
.....\.....\...........\.....\...........\Exam3-generated-files.hmap
.....\.....\...........\.....\...........\Exam3-own-target-headers.hmap
.....\.....\...........\.....\...........\Exam3-project-headers.hmap
.....\.....\...........\.....\...........\Exam3.dep
.....\.....\...........\.....\...........\Exam3.hmap
.....\.....\...........\.....\...........\Exam3~.dep
.....\.....\...........\.....\...........\Objects-normal
.....\.....\...........\.....\...........\..............\i386
.....\.....\...........\.....\...........\..............\....\Exam3.LinkFileList
.....\.....\...........\.....\...........\..............\....\MACalculator.o
.....\.....\...........\.....\...........\..............\....\main.o
.....\.....\...........\Exam3.pbxindex
.....\.....\...........\..............\categories.pbxbtree
.....\.....\...........\..............\cdecls.pbxbtree
.....\.....\...........\..............\decls.pbxbtree
.....\.....\...........\..............\files.pbxbtree
.....\.....\...........\..............\imports.pbxbtree
.....\.....\...........\..............\pbxindex.header
.....\.....\...........\..............\protocols.pbxbtree
.....\.....\...........\..............\refs.pbxbtree
.....\.....\...........\..............\strings.pbxstrings
.....\.....\...........\..............\..................\control
.....\.....\...........\..............\..................\strings
.....\.....\...........\..............\subclasses.pbxbtree
.....\.....\...........\..............\symbols0.pbxsymbols
__MACOSX\Exam3\build\Exam3.build
........\.....\.....\...........\._Exam3.pbxindex
........\.....\.....\._Exam3.build
........\.....\._build
Exam3\English.lproj
.....\.............\InfoPlist.strings
.....\.............\MainMenu.xib
.....\Exam3.xcodeproj
.....\...............\ivan.pbxuser
.....\...............\ivan.perspectivev3
.....\...............\project.pbxproj
.....\...............\TemplateIcon.icns
.....\Exam3_Prefix.pch
.....\Info.plist
.....\MACalculator.h
__MACOSX\Exam3\._MACalculator.h
Exam3\MACalculator.m
__MACOSX\Exam3\._MACalculator.m
Exam3\main.m

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