定义时钟clock类，满足以下要求：（1）有hour,minute,second私有成员变量。（2）定义构造函数和析构函数。（3）重载运算，实现对时间的改变，要求用类的成员函数实现。（4）重载运算符“+”

Question

定义时钟clock类，满足以下要求：（1）有hour,minute,second私有成员变量。（2）定义构造函数和析构函数。（3）重载运算，实现对时间的改变，要求用类的成员函数实现。（4）重载运算符“+”，函数原形为clock operator+（const clock&clock,const int second），含义为时钟加上second秒，用友元函数实现。（5）同4，加变减，用普通函数实现。急求！！

Answer 1

#include
class Clock
{
public:
Clock(const int h,const int m,const int s);
~Clock();
Clock& operator ++();
Clock& operator --();
Clock friend operator+(const Clock &clock, const int second);
Clock operator-(const int s);
Clock& operator=(Clock &clock);
void Show(){printf("%02d:%02d:%02d",hour,minute,second);}
private:
int hour;
int minute;
int second;
};
Clock::Clock(const int h,const int m,const int s)
{
hour=h,minute=m,second=s;
}
Clock::~Clock()
{
}
Clock& Clock::operator ++()
{
if(++second >=60)
{
minute+=second/60;
second%=60;
hour+=minute/60;
minute%=60;
}
return *this;
}
Clock& Clock::operator --()
{
second+=59;
minute+=second/60+59;
second%=60;
--hour+=minute/60;
minute%=60;
return *this;
}
Clock operator+(const Clock &clock, const int second)
{
static Clock ck(0,0,0);
ck.second=clock.second+second;
ck.minute=clock.minute+ck.second/60;
ck.second%=60;
ck.hour=clock.hour+ck.minute/60;
ck.minute%=60;
return ck;
}
Clock Clock::operator-(const int s)
{
static Clock ck(0,0,0);
ck.second=second-s%60+60;
ck.minute=minute+ck.second/60+59-s/60%60;
ck.second%=60;
ck.hour=hour+ck.minute/60-1-s/3600;
ck.minute%=60;
return ck;
}
Clock& Clock::operator=(Clock &clock)
{
hour=clock.hour;
minute=clock.minute;
second=clock.second;
return *this;
}
int main()
{
Clock ck(1,2,3);
ck.Show();
ck--;
ck.Show();
ck++;
ck.Show();
ck=ck-500;
ck.Show();
ck=ck+500;
ck.Show();
return 0;
} 上面是错的，不要崇拜哥