xcode总是报错expected identifier or '(

-(void)gengerate {

int a = 1 + arc4random() % 9;

int b = 1 + arc4random() % 9;

int sum = a + b;

struct label.text = [NSString stringWithFormat: @"%d + %d = ", a, b];

struct label.tag = sum;
}
在struct label.text = [NSString stringWithFormat: @"%d + %d = ", a, b];
和struct label.tag = sum;的后面

我是照书抄的呀，原文
label.text = [NSString stringWithFormat: @"%d + %d = ", a, b];
label.tag = sum;

然后经过xcode提示改成了这样，结果还是有问题

---