Objective c Person类未输出所需代码

我不熟悉objective c编程，下面的程序生成lldb，但我不知道为什么。我试着混了一会儿，但没有任何效果。有人能帮忙吗

 #import <Foundation/Foundation.h>

@interface Person: NSObject {

    //Field variables
    int weight;
    int age;
}

//The methds along with their return type and arguments (if they need them)
-(void) print;
-(void) setWeight: (int) w;
-(void) setAge: (int) a;
@end

@implementation Person

-(void) print {
    NSLog(@"My age is %i and I weigh %i", age, weight);
}

-(void) setWeight: (int) w {
    weight = age;
}

-(void) setAge: (int) a {
    age = a;
}
@end

int main( int argc, char *argv[]) {

    @autoreleasepool {
        Person *pav;

        pav = [[Person alloc] init];

        [pav setWeight: 145];
        [pav setAge: 19];
        [pav print];
    }

    return 0;

}

---

请发布stacktrace。@trojanfoe在左边它说这个argc int 1 argv char**0x7fff5fbff928 0x00007fff5fbff928，但我不太确定这是否是您要求在Xcode中运行项目的内容。等待它到达断点并在调试器控制台中键入bt，然后将输出添加到您的问题中。@trojanfoe lldb bt*线程1:tid=0xb5e8，0x0000000100000de6 mainmainargc=1，argv=0x00007fff5fbff928+22位于main.m:33，队列='com.apple.main thread'，停止原因=断点3.1*帧0:0x0000000100000de6 mainmainargc=1，argv=0x00007fff5fbff928+22位于main.m:33 lldbOK，添加异常断点并重试。