我正在开发我的第一个应用程序，我无法弄清楚这里的错误是我的代码：

Question

这是我的代码。有人可以解释如何在一步一步的方向修复它谢谢 我试图删除错误但它只会创建更多错误，如果有人可以帮助我会很感激

#import "ViewController.h"

@interface ViewController ()

@end

@interface ViewController ()

@end

@implementation ViewController



-(IBAction)number1:(id)sender{

    Selectnumber = Selectnumber * 10;
    Selectnumber = Selectnumber + 1;
    screen.text = [NSString stringWithFormat:@"%i", Selectnumber];


}
-(IBAction)number2:(id)sender{


    Selectnumber = Selectnumber * 10;
    Selectnumber = Selectnumber + 2;
    screen.text = [NSString stringWithFormat:@"%i",Selectnumber];

}

-(IBAction)number3:(id)sender{

    Selectnumber = Selectnumber * 10;
    Selectnumber = Selectnumber + 3;
   screen.text = [NSString stringWithFormat:@"%i", Selectnumber];

}

-(IBAction)number4:(id)sender{


    Selectnumber = Selectnumber * 10;
    Selectnumber = Selectnumber + 4;
    screen.text = [NSString stringWithFormat:@"%i", Selectnumber];


}
-(IBAction)number5:(id)sender{

    Selectnumber = Selectnumber * 10;
    Selectnumber = Selectnumber + 5;
    screen.text = [NSString stringWithFormat:@"%i", Selectnumber];

}
-(IBAction)number6:(id)sender{

    Selectnumber = Selectnumber * 10;
    Selectnumber = Selectnumber + 6;
    screen.text = [NSString stringWithFormat:@"%i", Selectnumber];


}
-(IBAction)number7:(id)sender{

    Selectnumber = Selectnumber * 10;
    Selectnumber = Selectnumber + 7;
    screen.text = [NSString stringWithFormat:@"%i", Selectnumber];
}
-(IBAction)number8:(id)sender{


    Selectnumber = Selectnumber * 10;
    Selectnumber = Selectnumber + 8;
    screen.text = [NSString stringWithFormat:@"%i", Selectnumber];
}
-(IBAction)number9:(id)sender{

    Selectnumber = Selectnumber * 10;
    Selectnumber = Selectnumber + 9;
    screen.text = [NSString stringWithFormat:@"%i", Selectnumber];
}
-(IBAction)number0:(id)sender{

    Selectnumber = Selectnumber * 10;
    Selectnumber = Selectnumber + 0;
    screen.text = [NSString stringWithFormat:@"%i", Selectnumber];

}
-(IBAction)Times:(id)sender{






    if (Runningtotal ==0) {

        Runningtotal = Selectnumber;
    }
    else{

        switch (Method) {
            case 1:
                Runningtotal = Runningtotal* Selectnumber;
                break;
            case 2:
                Runningtotal = Runningtotal / Selectnumber;
                break;
            case 3:
                Runningtotal = Runningtotal - Selectnumber;
                break;
            case 4: Runningtotal = Runningtotal + Selectnumber;
                break;
            default:
                break;
        }

    }

    Method = 1;
    Selectnumber = 0;
}


-(IBAction)devide:(id)sender{


    if (Runningtotal ==0) {

        Runningtotal = Selectnumber;
    }
    else{

        switch (Method) {
            case 1:
                Runningtotal = Runningtotal* Selectnumber;
                break;
            case 2:
                Runningtotal = Runningtotal / Selectnumber;
                break;
            case 3:
                Runningtotal = Runningtotal - Selectnumber;
                break;
            case 4: Runningtotal = Runningtotal + Selectnumber;
                break;
            default:
                break;

        }

    }

    Method = 2;
    Selectnumber = 0;
}
-(IBAction)Subtract:(id)sender{



    if (Runningtotal ==0) {

        Runningtotal = Selectnumber;
    }
    else{

        switch (Method) {
            case 1:
                Runningtotal = Runningtotal* Selectnumber;
                break;
            case 2:
                Runningtotal = Runningtotal / Selectnumber;
                break;
            case 3:
                Runningtotal = Runningtotal - Selectnumber;
                break;
            case 4: Runningtotal = Runningtotal + Selectnumber;
                break;
            default:
                break;
        }

    }


    Method = 3;
    Selectnumber = 0;
}
-(IBAction)Plus:(id)sender{




    if (Runningtotal ==0) {

        Runningtotal = Selectnumber;
    }
    else{

        switch (Method) {
            case 1:
                Runningtotal = Runningtotal* Selectnumber;
                break;
            case 2:
                Runningtotal = Runningtotal / Selectnumber;
                break;
            case 3:
                Runningtotal = Runningtotal - Selectnumber;
                break;
            case 4: Runningtotal = Runningtotal + Selectnumber;
                break;
            default:
                break;






        }
    }


    Method = 4;
    Selectnumber = 0;

}
-(IBAction)allclear:(id)sender{

    Method = 0;
    Runningtotal = 0;
    Selectnumber = 0;
    screen.text = [NSString stringWithFormat:@"0"];
}
-(IBAction)Equals:(id)sender{



    if (Runningtotal ==0) {

        Runningtotal = Selectnumber;
    }
    else{

        switch (Method) {
            case 1:
                Runningtotal = Runningtotal* Selectnumber;
                break;
            case 2:
                Runningtotal = Runningtotal / Selectnumber;
                break;
            case 3:
                Runningtotal = Runningtotal - Selectnumber;
                break;
            case 4: Runningtotal = Runningtotal + Selectnumber;
                break;
            default:

                break;
        }

    }
    Method = 0;
    Selectnumber = 0;
    screen.text = [NSString stringWithFormat: @"%.2f", Runningtotal];

}





-(IBAction)percent:(id)sender {


}

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

下一行是我遇到麻烦的地方：程序中意外的'@'

@implementation ViewController
    -(void)ViewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end
} @end

这里是.h

#import <UIKit/UIKit.h>

int Method;
int Selectnumber;
float Runningtotal;


@interface ViewController : UIViewController

{

    IBOutlet UILabel *screen;


}

-(IBAction)number1:(id)sender;
-(IBAction)number2:(id)sender;
-(IBAction)number3:(id)sender;
-(IBAction)number4:(id)sender;
-(IBAction)number5:(id)sender;
-(IBAction)number6:(id)sender;
-(IBAction)number7:(id)sender;
-(IBAction)number8:(id)sender;
-(IBAction)number9:(id)sender;
-(IBAction)number0:(id)sender;
-(IBAction)Times:(id)sender;
-(IBAction)devide:(id)sender;
-(IBAction)Subtract:(id)sender;
-(IBAction)Plus:(id)sender;
-(IBAction)Equals:(id)sender;
-(IBAction)allclear:(id)sender;
-(IBAction)decimalpressed:(id)sender;
-(IBAction)percent:(id)sender;

@end

---

Answer 1

ViewDidLoad应为viewDidLoad，小写＆＃34; v。＆＃34;另外我相信你有太多@end陈述......