Xcode 制作简易计算器

#import "ViewController.h"

#import "jsq.h"

 

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UILabel *label;

@end

@implementation ViewController
 

- (void)viewDidLoad {

    [super viewDidLoad];

    jsqq = [[jsq alloc] init];  //初始化对象jsqq

}

- (IBAction)v:(UIButton *)sender {

    if(jsqq.op==0) //判断是否已经按了运算符

    {

        jsqq.op1 = jsqq.op1*10 + sender.tag;

        self.label.text = [NSString stringWithFormat:@"%f",jsqq.op1];

        //将浮点数转化为字符串，并显示在label上

    }

    else {

        jsqq.op2 = jsqq.op2*10 + sender.tag;

        self.label.text = [NSString stringWithFormat:@"%f",jsqq.op2];

    }
 
}

- (IBAction)c:(UIButton *)sender {

    if(sender.tag==11)

    {

        self.label.text =@"+";//在label上显示字符“+”

        jsqq.op = ‘+‘;

    }

   else if(sender.tag==12)

    {

        self.label.text =@"-";

        jsqq.op = ‘-‘;

    }

    else if(sender.tag==13)

    {

        self.label.text =@"*";

        jsqq.op = ‘*‘;

    }

   else if(sender.tag==14)

    {

        self.label.text =@"/";

        jsqq.op = ‘/‘;

    }
    
    else if(sender.tag==15) //“=”键

    {

        float resurt;

        if(jsqq.op == ‘+‘){

            resurt = [jsqq add]; //调用方法，算出结果

        }

        else if(jsqq.op == ‘-‘){

            resurt = [jsqq sub];

        }

        else if(jsqq.op == ‘*‘){

            resurt = [jsqq mu];

        }

        else if(jsqq.op == ‘/‘){

            resurt = [jsqq div];

        }

        self.label.text = [NSString stringWithFormat:@"%f",resurt];

        jsqq.op1 = resurt;

        jsqq.op2 = 0;

    }    

        else if(sender.tag==16) //清零 “c”键

        {

            jsqq.op = 0;

            jsqq.op1 = 0;

            jsqq.op2 = 0;

            self.label.text =@"0";

        }

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end