对象和方法之间的关系

int main(int argc, const char * argv[])
{
    //    1.创建士兵对象
    Soldier *s1 = [Soldier new];
    s1->_name = @"jack";
    s1->_life = 10;
    s1->_level = kSoldierLevel1;

    //    2.创建枪对象
    Gun *gun = [Gun new];
    gun->_bulletCount = 100;

    //    3.射击
    [s1 fireByGun:gun];
}

@implementation Soldier

- (void)fireByGun:(Gun *)gun
{
    [gun shoot];
}

@end

@implementation Shop

- (Gun *)buyGun
{
    Gun *gun = [Gun new];
    gun->_bulletCount = 100;
    return gun;
}

@end