实现Time类的运算符重载

/*    

*程序的版权和版本声明部分          

* Copyright (c)2013, 烟台大学计算机学院学生        

* All rightsreserved.         

* 文件名称：CTime .cpp       

* 作    者：  田凤        

*完成日期：2013年5月8日      

* 版本号： v1.0                 

* 输入描述： 输入时间

* 问题描述：略

* 输出：输出时间

*代码：

#include<iostream>
using namespace std;
class CTime
{
private:
 unsigned short int hour;    // 时
    unsigned short int minute;  // 分
    unsigned short int second;  // 秒 
public:
 CTime(int h=0,int m=0,int s=0);
 void setTime(int h,int m,int s);
    void display();
    //比较运算符(二目)的重载
 bool operator >(CTime &t);
 bool operator <(CTime &t);
    bool operator >= (CTime &t);
    bool operator <= (CTime &t);      //判断时间
 bool operator == (CTime &t);
    bool operator != (CTime &t);
 //二目运算符的重载
    CTime operator+(CTime &c);//返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15
    CTime operator-(CTime &c);//对照+理解
    CTime operator+(int s);//返回s秒后的时间
    CTime operator-(int s);//返回s秒前的时间
    //一目运算符的重载
 CTime operator++( int);//后置++，下一秒
    CTime operator++();//前置++，下一秒，前置与后置返回值不一样
    CTime operator--( int);//后置--，前一秒
    CTime operator--();//前置--，前一秒
    //赋值运算符的重载
    CTime operator+=(CTime &c);
    CTime operator-=(CTime &c);
    CTime operator+=(int s);
    CTime operator-=(int s);
 friend ostream&operator<<(ostream&,Complex&);//声明友元重载运算符"<<"函数(输出)
 friend istream&operator>>(istream&,Complex&);//声明友元重载运算符">>"函数(输入)
};
CTime::CTime(int h,int m,int s)//构造函数
{
 hour=h;
 minute=m;
 second=s;
}
void CTime::setTime(int h,int m,int s)//设置时间
{
 hour=h;
 minute=m;
 second=s;
}
void CTime::display()//输出时间
{
 cout<<hour<<":"<<minute<<":"<<second<<endl;
}
bool CTime::operator >(CTime &t)//判断时间t1>t2

{
 if(hour>t.hour)
  return true;
 else if(hour==t.hour&&minute>t.minute)
  return true;
 else if(hour==t.hour&&minute==t.minute&&second>t.second)
  return true;
 else
  return false;
}
bool CTime::operator <(CTime &t)//判断时间t1<t2
{
 if(hour<t.hour)
  return true;
 else if(hour==t.hour&&minute<t.minute)
  return true;
 else if(hour==t.hour&&minute==t.minute&&second<t.second)
  return true;
 else
  return false;
}
bool CTime::operator >= (CTime &t)//判断时间t1>=t2
{
 if(hour>t.hour)
  return true;
 else if(hour==t.hour&&minute>t.minute)
  return true;
 else if(hour==t.hour&&minute==t.minute&&second>=t.second)
  return true;
 else
  return false;
}
bool CTime::operator <= (CTime &t)//判断时间t1<=t2
{
 if(hour<t.hour)
  return true;
 else if(hour==t.hour&&minute<t.minute)
  return true;
 else if(hour==t.hour&&minute==t.minute&&second<=t.second)
  return true;
 else
  return false;
}
bool CTime::operator == (CTime &t)//判断时间t1==t2
{
 if(hour==t.hour&&minute==t.minute&&second==t.second)
  return true;
 else
  return false;
}
bool CTime::operator != (CTime &t)//判断时间t1!=t2
{
 if(hour==t.hour&&minute==t.minute&&second==t.second)
  return false;
 else
  return true;
}
CTime CTime::operator+(CTime &c)//计算时间和
{
 int h,m,s;
 h=hour+c.hour;
 m=minute+c.minute;
 s=second+c.second;
 if(s>60)
    {
        s-=60;//(s=s%60)
        m++;  //增加分钟
    }
    if(m>60)
    {
        m-=60; //(m=m%60）
        h++;   //增加小时
    }
 if(h>24)
 {
  h-=24; //(h=h%24)
 }
 CTime T(h,m,s);
 return T;
}
CTime CTime::operator-(CTime &c)//计算时间差
{
 int h,m,s;
 h=hour-c.hour;
 m=minute-c.minute;
 s=second-c.second;
 if(s<0)
    {
        s+=60;//(s=60+s)
        m--;  //减分钟
    }
    if(m<0)
    {
        m+=60; //(m=60+m)
        h--;   //增加小时
    }
 if(h<0)
 {
  h+=24;
 }
 CTime T(h,m,s);
 return T;
}
CTime CTime::operator+(int s)//返回s秒后的时间
{
 int ss=s%60;
 int mm=(s/60)%60;
 int hh=s/3600;
 CTime T(hh,mm,ss);
 return *this+T;
}
CTime CTime::operator-(int s)//返回s秒前的时间
{
 int ss=s%60;
    int mm=(s/60)%60;
    int hh=s/3600;
 CTime T(hh,mm,ss);
    return *this-T;
}
CTime CTime::operator++(int)//后置++，下一秒
{
 CTime t=*this;
    *this=*this+1;
    return t;
}
CTime CTime::operator++()//前置++，下一秒
{
 *this=*this+1;
    return *this;
}
CTime CTime::operator--(int)//后置--，前一秒
{
 CTime t=*this;
    *this=*this-1;
    return t;
}
CTime CTime::operator--()//前置--，前一秒
{
 *this=*this-1;
    return *this;
}
CTime CTime::operator+=(CTime &c)
{
 *this=*this+c;
    return *this;
}
CTime CTime::operator-=(CTime &c)
{
 *this=*this-c;
    return *this;
}
CTime CTime::operator+=(int s)
{
 *this=*this+s;
    return *this;
}
CTime CTime::operator-=(int s)
{
 *this=*this-s;
    return *this;
}
ostream&operator<<(ostream&output,Complex&c)
{
    output<<"("<<c.real;
    if(c.imag>=0)output<<"+";
    output<<c.imag<<"i)"<<endl;
    return output;
}
istream&operator>>(istream&input,Complex&c)
{
    int a,b;
    char sign,i;
    input>>a>>sign>>b>>i;
    while(!((sign=='+'||sign=='-')&&i=='i'));
    c.real=a;
    c.imag=(sign=='+')?b:-b;
    return input;
}
int main()
{
    CTime t1,t2,t;
 cout<<"t1为:";
 cin>>t1;
 cout<<"t2为:";
 cin>>t2;
    cout<<"下面比较两个时间大小:\n";
    if (t1>t2) cout<<"t1>t2"<<endl;
    if (t1<t2) cout<<"t1<t2"<<endl;
    if (t1==t2) cout<<"t1＝t2"<<endl;
    if (t1!=t2) cout<<"t1≠t2"<<endl;
    if (t1>=t2) cout<<"t1≥t2"<<endl;
    if (t1<=t2) cout<<"t1≤t2"<<endl;
    t=t1+t2;
 cout<<"t1+t2="<<t<<endl;
 t=t1-t2;
 cout<<"t1-t2="<<t<<endl;
 t=t1+1000;
 cout<<"t1+1000="<<t<<endl;
 t=t1-1000;
 cout<<"t1-1000="<<t<<endl;
 t=++t1;
 cout<<"前置++为:";
 cout<<t<<endl;
 t=t1++;
 cout<<"后置++为:";
 cout<<t<<endl;
 t=--t1;
 cout<<"前置--为:";
 cout<<t<<endl;
 t=t1--;
 cout<<"后置--为:";
 cout<<t<<endl;
 t1+=t2;
 cout<<"t1+=t2为:";
 cout<<t<<endl;
 t1-=t2;
 cout<<"t1-=t2为:";
 cout<<t<<endl;
 t1+=1000;
 cout<<"t1+=1000为:";
 cout<<t<<endl;
 t1-=1000;
    cout<<"t1-=1000为:";
 cout<<t<<endl;
 return 0;
}