问题是 ；

//    NSString *(^block2)(NSString *name; int age) = ^(NSString *name, int age){
    
      NSString *(^block2)(NSString *name,int age) = ^(NSString *name, int age){
        return [NSString stringWithFormat:@"姓名: %@, 年龄: %d",name , age];   
        };           
    NSString *ret = block2(@"小明",26);
    NSLog(@"ret: %@", ret);

问题： (int)

int (^block2)(NSString *name);    
    block2 = ^(NSString *name){    
    
//        return name.length;   
     
        return (int)name.length;        
    };    
    int ret2 = block2(@"李四");    
    NSLog(@"李四哥:ret2 = %d",ret2);