第九周——运算符重载——项目二Time类(续)

问题及代码：

/*
*Copyright (c) 2014,烟台大学计算机学院
*All rights reserved.
*文件名称:lily.cpp
*作者:李莉
*完成日期:2015年5月5日
*版本号:v1.0
*
*问题描述：实现Time类中的运算符重载,包括一模运算符语输入输出流
*程序输入：无输入
*程序输出：计算后的时间
*/
#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);
    friend ostream& operator<<(ostream& output,CTime t);
    friend istream& operator>>(istream& input,CTime &t);
    //二目的比较运算符重载
    bool operator > (CTime &t);
    bool operator < (CTime &t);
    bool operator >= (CTime &t);
    bool  operator <= (CTime &t);
    bool operator == (CTime &t);
    bool operator != (CTime &t);
    	//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
    CTime operator+(CTime &t);
    CTime operator-(CTime &t);//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
    //二目赋值运算符的重载
    CTime operator+=(CTime &c);
    CTime operator-=(CTime &c);
    CTime operator+=(int s);//返回s秒后的时间
    CTime operator-=(int s);//返回s秒前的时间
};
CTime::CTime(int h,int m,int s)
{
    hour=h;
    minute=m;
    second=s;
}
void CTime::setTime(int h,int m,int s)
{
    hour=h;
    minute=m;
    second=s;
}
istream&operator>>(istream& input,CTime &t)
{
    char s1,s2;
    while(1)
    {
        cout<<"请输入时间(hh:mm:ss):"<<endl;
        input>>t.hour>>s1>>t.minute>>s2>>t.second;
            if (t.hour>-1 && t.hour<24 && t.minute>-1 && t.minute<60 && t.second>-1 && t.second<60) break;
        cerr<<"时间格式不正确! 请重新输入\n";
    }
    return input;
}
ostream&operator<<(ostream&output,CTime t)
{
    output<<t.hour<<":"<<t.minute<<":"<<t.second;
}

bool CTime::operator>(CTime &t)
{
   if(hour>t.hour)return true;
   if(hour<t.hour)return false;
   if(minute>t.minute)return true;
   if(minute<t.minute)return false;
   if(second>t.second)return true;
   if(second<t.second)return false;
   return false;
}
bool CTime::operator<(CTime &t)
{
    if(hour<t.hour)return true;
    if(hour>t.hour)return false;
    if(minute<t.minute)return true;
    if(minute>t.minute)return false;
    if(second<t.second)return true;
    if(second>t.second)return false;
    return false;
}
bool CTime::operator==(CTime &t)

{
    if(*this<t||*this>t)
        return false;
    return true;
}
bool CTime::operator!=(CTime &t)
{
    if(*this==t)return false;
    return true;
}
bool CTime::operator>=(CTime &t)
{
    if(*this<t)return false;
    return true;
}
bool CTime::operator<=(CTime &t)
{
    if(*this>t)return false;
    return true;
}
CTime CTime::operator++()
{
    *this=*this+1;
    return *this;
}
CTime CTime::operator++(int)
{
    CTime t=*this;
    *this=*this+1;
    return t;
}
CTime CTime::operator--()
{
    *this=*this-1;
    return *this;
}
CTime CTime::operator--(int)
{
    CTime t=*this;
    *this=*this-1;
    return t;
}
CTime CTime::operator+(CTime &t)
{
    int h,m,s;
    s=second+t.second;
    m=minute+t.minute;
    h=hour+t.hour;
    if(s>59)
    {
        s=s-60;
        m++;
    }
    if(m>59)
    {
        m=m-60;
        h++;
    }
    if(h>23)h=h-24;
    CTime t0(h,m,s);
    return t0;
}
CTime CTime::operator+(int s)
{
    int h,m,s0;
    s0=s%60;
    m=(s/60)%60;
    h=s/3600;
    CTime t0(h,m,s0);
    return t0+*this;
}
CTime CTime::operator-(CTime &t)
{
    int h,m,s;
    s=second-t.second;
    m=minute-t.minute;
    h=hour-t.hour;
    if(s<0)
    {
        s+=60;
        m--;
    }
    if(m<0)
    {
        m+=60;
        h--;
    }
    if(h<24)hour--;
    CTime t0(h,m,s);
    return t0;
}
CTime CTime::operator-(int s)
{
    int h,m,s0;
    s0=s%60;
    m=(s0/60)%60;
    h=s/3600;
    CTime t0(h,m,s0);
    return *this-t0;
}
CTime CTime::operator+=(CTime &t)
{
    *this=*this+t;
    return *this;
}
CTime CTime::operator-=(CTime &t)
{
    *this=*this-t;
    return *this;
}
CTime CTime::operator+=(int s)
{
    *this=*this-s;
    return *this;
}
CTime CTime::operator-=(int s)
{
    *this=*this-s;
    return *this;
}
int main()
{
    CTime t1(10,25,56),t2(11,25,55),t;
    cout<<"t1的时间为："<<endl;
    cout<<t1<<endl;
    cout<<"t2的时间为："<<endl;
    cout<<t2<<endl;
    cout<<"根据下面的两个时间的关系来计算时间："<<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;
    if(t1<=t2)
        cout<<"t1<=t2"<<endl;
        t=t1+t2;
        cout<<t<<endl;
        t=t2-t1;
        cout<<t<<endl;
        t1+=t2;
        cout<<t<<endl;
        t1-=t2;
        cout<<t<<endl;
        t1+=100;
        cout<<t<<endl;
        t1-=100;
        cout<<t<<endl;
        t=++t;
        cout<<"++t:"<<t<<endl;
        t=t++;
        cout<<"t++:"<<t<<endl;
        t=t--;
        cout<<"t--"<<t<<endl;
        t=--t;
        cout<<"--t:"<<t<<endl;
    cout<<endl;
    return 0;

}

运行结果：

心得体会：

我能说我犯了个超级低级的错误吗！！！我竟然在重载<<和>>运算符时忘记<<>>了。。。