OC 类的使用

#import <Foundation/Foundation.h>
@interface Dog :NSObject{
    @public
    NSString *_name;
}
-(void)bitOtherDog:(Dog *) otherDog;
@end

@implementation Dog

- (void) bitOtherDog:(Dog *) otherDog{
    NSLog(@"%@ bit other dog %@", _name, otherDog->_name);
}
@end

@interface Person :NSObject{
    @public
    NSString *_username;
    int _age;
}
-(void)orderDog :(Dog *) dog bitOhterDog:(Dog *) other;

-(Dog *) selDog;

@end

@implementation Person

-(void)orderDog :(Dog *) dog bitOhterDog:(Dog *) other{
    NSLog(@"%@ order dog", _username);
    [dog bitOtherDog:other];
}

-(Dog *) selDog{
    return [Dog new];
}

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

    @autoreleasepool {

        Dog *dog = [Dog new];
        dog ->_name = @"tom";

        Dog *otherDog = [Dog new];
        otherDog ->_name = @"jack";
        [dog bitOtherDog:otherDog];

        Person *p = [Person new];
        p->_username = @"lovoo";
        [p orderDog:dog bitOhterDog:otherDog];

        Dog *selDog = [p selDog];

    }
    return 0;
}