步驟：
1.開啟xcode，單機creat a new xcode project
3.填寫專案名稱單機next
4.viewcontroller.h中定義成員和方法
#import
@inte***ce viewcontroller : uiviewcontroller
@property(retain,nonatomic)uibutton *button;
@property(retain,nonatomic)uilabel *label;
@property(retain,nonatomic)nsmutablestring *string;
@property(assign,nonatomic)double num1,num2,num3,num4;
@end
4.viewcontroller.m
#import "viewcontroller.h"
@inte***ce viewcontroller ()
@end
@implementation viewcontroller
@synthesize button,label,string,num1,num2,num3,num4;//string儲存字元，顯示數值。num1是存輸入的數值，num2是存運算子前的數值，num3是運算結果，num4是判斷進行何種運算
- (void)viewdidload
} //單獨新增0
uibutton *button0=[uibutton buttonwithtype:uibuttontyperoundedrect];
[button0 setframe:cgrectmake(30, 345, 60, 60)];
[button0 settitle:@"0" forstate:uicontrolstatenormal];
[button0 addtarget:self action:@selector(one:) forcontrolevents:uicontroleventtouchupinside];
[self.view addsubview:button0];
//新增運算子
nsarray *array1=[nsarray arraywithobjects:@"+",@"-",@"*",@"/",nil];
for (int i=0; i<4; i++)
//新增=
uibutton *button2=[uibutton buttonwithtype:uibuttontyperoundedrect];
[button2 setframe:cgrectmake(160, 410, 125, 35)];
[button2 settitle:@"=" forstate:uicontrolstatenormal];
[button2 addtarget:self action:@selector(go:) forcontrolevents:uicontroleventtouchupinside];
[self.view addsubview:button2];
//新增清除鍵
uibutton *button3=[uibutton buttonwithtype:uibuttontyperoundedrect];
[button3 setframe:cgrectmake(30, 410, 125, 35)];
[button3 settitle:@"ac" forstate:uicontrolstatenormal];
[button3 addtarget:self action:@selector(clean:) forcontrolevents:uicontroleventtouchupinside];
[self.view addsubview:button3];
//新增.
uibutton *button4=[uibutton buttonwithtype:uibuttontyperoundedrect];
[button4 setframe:cgrectmake(95, 345, 60, 60)];
[button4 settitle:@"." forstate:uicontrolstatenormal];
[button4 addtarget:self action:@selector(one:) forcontrolevents:uicontroleventtouchupinside];
[self.view addsubview:button4];
//後退
uibutton *button5=[uibutton buttonwithtype:uibuttontyperoundedrect];
[button5 setframe:cgrectmake(160, 345, 60, 60)];
[button5 settitle:@"back" forstate:uicontrolstatenormal];
[button5 addtarget:self action:@selector(back:) forcontrolevents:uicontroleventtouchupinside];
[self.view addsubview:button5];
self.string=[[nsmutablestring alloc]init];//初始化可變字串，分配記憶體
// do any additional setup after loading the view, typically from a nib.
}-(void)one:(id)sender
self.label.text=[nsstring stringwithstring:string];//顯示數值
self.num1=[self.label.text doublevalue];//儲存輸入的數值
nslog(@"%f",self.num1);
}-(void)two:(id)sender
//判斷輸入是-號
else if([self.string hasprefix:@"-"])//hasprefix:判斷字串以減號開頭
//判斷輸入是*號
else if([self.string hasprefix:@"*"])//hasprefix:判斷字串以乘號開頭
//判斷輸入是/號
else if([self.string hasprefix:@"/"])//hasprefix:判斷字串以除號開頭 }
-(void)go:(id)sender
//判斷輸入是-號
else if(self.num4==2)
//判斷輸入是*號
else if(self.num4==3)
//判斷輸入是/號
else if(self.num4==4) }
//當按下清除建時，所有資料清零
-(void)clean:(id)sender
//返回鍵
-(void)back:(id)sender
}- (void)viewdidunload
- (bool)shouldautorotatetointe***ceorientation:(uiinte***ceorientation)inte***ceorientation
@end
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