150 和100做差后用字符串输出

#import<Foudation/Foundation.h>

int main(){

@autoreleasepool{

 

NSString *str1 = @"150";

NSString *str2 = @"100";

//intValue 是返回一个int类型的字符串

int num1 =[str1 intValue];

int num2 =[str2 intValue];

NSString *str3 = [NSString  stringWithFormat:"%d",(num1 - num2)];

NSLog(@"%@",str3);

}

return 0;

}