第9周项目2Time类中运算符重载（续）

问题描述：

定义对时间对象的自增自减，一目运算符和<<>>运算符重载，实现时间的输入输出

#include <iostream>

using namespace std;
class CTime
{
private:
    int hour,minute,sec;
public:
    CTime ()
    {
        hour=0,minute=0,sec=0;
    }
    CTime(int h,int m,int s):hour(h),minute(m),sec(s) {}
    void settime(int h,int m,int s);
    //一目运算符的重载
    CTime operator++(int );
    CTime operator++();
    CTime operator--(int );
    CTime operator--();
    //二目运算符的重载
    CTime operator +(CTime &);
    CTime   operator-(CTime &);
    CTime  operator+(int );
    CTime  operator-(int );
    //赋值运算符的重载
    CTime operator+=(CTime &);
    CTime operator-=(CTime &);
    CTime operator+=(int );
    CTime operator-=(int );
    //比较运算符的重载
    bool operator>(CTime &);
    bool operator<(CTime &);
    bool operator>=(CTime &);
    bool operator<=(CTime &);
    bool operator==(CTime &);
    bool operator!=(CTime &);
    //输入输出运算符的重载
    friend istream&operator>>(istream&,CTime &c);
    friend  ostream&operator<<(ostream&,CTime &c);
};
void CTime::settime(int h,int m,int s)
{
    hour=h;
    minute=m;
    sec=s;
}
//输入输出运算符的重载的定义
ostream&operator<<(ostream&output,CTime &c)
{
    output<<c.hour<<":"<<c.minute<<":"<<c.sec;
    return output;
}
istream&operator>>(istream&input,CTime &c)
{
    char ch;
    while(1)
    {
        cout<<"请输入一个时间:"<<endl;
        input>>c.hour>>ch>>c.minute>>ch>>c.sec;
        if(ch==':')
            if(c.hour>=0&&c.hour<24&&c.minute>=0&&c.minute<60&&c.sec>=0&&c.sec<60)
            break;
        cerr<<"输入格式不正确，请重新输入:"<<endl;
    }
    return input;
}
//一目运算符的重载的定义
CTime CTime::operator++()
{

    *this=*this+1;
    return *this;
}
CTime CTime::operator++(int )
{
    CTime c=*this;
    *this=*this+1;
    return c;

}
CTime CTime::operator--()
{
    *this=*this-1;
    return *this;
}
CTime CTime::operator--(int )
{
    CTime c=*this;
    *this=*this-1;
    return c;

}
//二目运算符的重载的定义
CTime CTime::operator+(CTime &c)
{
   int h,m,s;
   h=hour+c.hour;
   m=minute+c.minute;
   s=sec+c.sec;
   if(s>=60)
   {
       s-=60;
       m++;
   }
   if(m>=60)
   {
       m-=60;
       h++;
   }
   while(h>=24)
   {
       h-=24;
   }
   CTime t(h,m,s);
   return t;

}
CTime CTime::operator+(int s)
{
    int ss,mm,hh;
    ss=s%60;
    mm=(s/60)%60;
    hh=s/3600;
    CTime t(hh,mm,ss);
    return *this+t;
}
CTime CTime::operator-(CTime &c)
{
   int h,m,s;
   h=hour+c.hour;
   m=minute+c.minute;
   s=sec+c.sec;
   if(s<0)
   {
       s+=60;
       m--;
   }
   if(m<0)
   {
       m+=60;
       h--;
   }
   while(h<0)
   {
       h+=24;
   }
   CTime t(h,m,s);
   return t;

}
CTime CTime::operator-(int s)
{
    int ss,mm,hh;
    ss=s%60;
    mm=(s/60)%60;
    hh=s/3600;
    CTime t(hh,mm,ss);
    return *this-t;
}

//赋值运算符的重载的定义
CTime CTime::operator+=(CTime &c)
{
    *this+=c;
    return *this;
}
CTime CTime::operator-=(CTime &c)
{
    *this-=c;
    return *this;
}
CTime CTime:: operator+=(int c)
{
    *this+=c;
    return *this;
}
CTime CTime::operator-=( int c)
{
    *this-=c;
    return *this;
}
//比较运算符的重载的定义
 bool CTime::operator>(CTime &c)
{
    if(hour>c.hour)return true;
    if(hour<c.hour) return false;
    if(minute>c.minute)return true;
    if(minute<c.minute)return false;
    if(sec>c.sec)return true;
    if(sec<c.sec)return false;
}
bool CTime::operator<(CTime &c)
{
    if(hour<c.hour)return true;
    if(hour>c.hour) return false;
    if(minute<c.minute)return true;
    if(minute>c.minute)return false;
    if(sec<c.sec)return true;
    if(sec>c.sec)return false;
}
bool CTime::operator>=(CTime &c)
{
    if(*this<c)
        return false;
    else
        return true;
}
bool CTime::operator <=(CTime &c)
{
    if(*this>c)
        return false;
    else
        return true;
}
bool CTime::operator==(CTime&c)
{
    if(*this>c||*this<c)
        return false;
    else
        return true;
}
bool CTime::operator!=(CTime &c)
{
    if(*this==c)
        return false;
    else
        return true;
}
int main()
{
    CTime c1,c2,c;
    cout<<"c1为 ";
    cin>>c1;
    cout<<"c2为 ";
    cin>>c2;
    cout<<"比较c1,c2这两个时间的大小:"<<endl;
    if(c1>c2)cout<<"c1>c2"<<endl;
    if(c1<c2)cout<<"c1<c2"<<endl;
    if(c1>=c2)cout<<"c1>=c2"<<endl;
    if(c1<c2)cout<<"c1<=c2"<<endl;
    if(c1==c2)cout<<"c1==c2"<<endl;
    if(c1!=c2)cout<<"c1!=c2"<<endl;
    cout<<"c1="<<c1<<"     c2="<<c2<<endl;
    cout<<"c=t1++"<<endl;
    c=c1++;
    cout<<"c= "<<c<<"    c1= "<<c1<<endl;

    cout<<"c=++c1"<<endl;
    c=++c1;

    cout<<"c= "<<c<<"    c1= "<<c1<<endl;
    return 0;
}