A simple calculator is in Xcode to achieve, in Objective-C compiler.

Calculator
..........\build
..........\.....\Calculator.build
..........\.....\................\Calculator.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
........\Calculator
........\..........\build
........\..........\.....\Calculator.build
........\..........\.....\................\._Calculator.pbxindex
Calculator\build\Calculator.build\Debug-iphonesimulator
..........\.....\................\.....................\Calculator.build
..........\.....\................\.....................\................\build-state.dat
..........\.....\................\.....................\................\build-state~.dat
..........\.....\................\.....................\................\Calculator-all-target-headers.hmap
..........\.....\................\.....................\................\Calculator-generated-files.hmap
..........\.....\................\.....................\................\Calculator-own-target-headers.hmap
..........\.....\................\.....................\................\Calculator-project-headers.hmap
..........\.....\................\.....................\................\Calculator.dep
..........\.....\................\.....................\................\Calculator.hmap
..........\.....\................\.....................\................\Calculator~.dep
..........\.....\................\.....................\................\Objects-normal
..........\.....\................\.....................\................\..............\i386
..........\.....\................\.....................\................\..............\....\Calculator.LinkFileList
..........\.....\................\.....................\................\..............\....\CalculatorAppDelegate.o
..........\.....\................\.....................\................\..............\....\CalculatorViewController.o
..........\.....\................\.....................\................\..............\....\main.o
__MACOSX\Calculator\build\._Calculator.build
Calculator\build\Debug-iphonesimulator
..........\.....\.....................\Calculator.app
..........\.....\.....................\..............\Calculator
..........\.....\.....................\..............\CalculatorViewController.nib
..........\.....\.....................\..............\Info.plist
..........\.....\.....................\..............\MainWindow.nib
..........\.....\.....................\..............\PkgInfo
..........\.....\.....................\Calculator.app.dSYM
..........\.....\.....................\...................\Contents
..........\.....\.....................\...................\........\Info.plist
..........\.....\.....................\...................\........\Resources
..........\.....\.....................\...................\........\.........\DWARF
..........\.....\.....................\...................\........\.........\.....\Calculator
__MACOSX\Calculator\._build
Calculator\Calculator-Info.plist
..........\Calculator.xcodeproj
..........\....................\project.pbxproj
..........\....................\ptc.mode1v3
..........\....................\ptc.pbxuser
..........\....................\victor.pbxuser
..........\...

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