第九周上机任务项目2-Time类

01./*      
02.* 程序的版权和版本声明部分      
03.* Copyright (c)2013, 烟台大学计算机学院学生      
04.* All rightsreserved.      
05.* 文件名称： ctime.cpp                                 
06.* 作    者：赵冠哲                                  
07.* 完成日期：2013年5月7日      
08.* 版本号： v1.0            
09.* 输入描述：      
10.* 问题描述：    
11.*/ 
#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(){}
    friend istream& operator >> (istream&, CTime&);
    friend ostream& operator << (ostream&, CTime&);
    //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);
    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
    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
    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);//返回s秒后的时间
    CTime operator-=(int s);//返回s秒前的时间
};
//下面实现所有的运算符重载代码。
//为简化编程，请注意通过调用已有函数，利用好各函数之间的关系
istream& operator >> (istream& input, CTime& t)
{
    cout << "请输入时分秒（h m s）：" << endl;

    input >> t.hour >> t.minute >> t.second;
    if (t.hour < 0 || t.hour > 59 || t.minute < 0 || t.minute > 59 || t.second < 0 || t.second > 59)
    {
        t.hour = 0, t.minute = 0, t.second = 0;
        cout << "时间非法！" << endl;
        exit(0);
    }
    return input;
}
ostream& operator << (ostream& output, CTime& t)
{
    output << t.hour << ":" << t.minute << ":" << t.second;

    return output;
}
bool CTime::operator > (CTime &t)
{
    if (hour > t.hour)
        return true;
    else if (hour == t.hour && minute > t.minute)
        return true;
    else if (minute == t.minute && second > t.second)
        return true;
    else
        return false;
}
bool CTime::operator < (CTime &t)
{
    if (hour < t.hour)
        return true;
    else if (hour == t.hour && minute < t.minute)
        return true;
    else if (minute == t.minute && second < t.second)
        return true;
    else
        return false;
}
bool CTime::operator >= (CTime &t)
{
    if (hour > t.hour)
        return true;
    else if (hour == t.hour && minute > t.minute)
        return true;
    else if (minute == t.minute && second >= t.second)
        return true;
    else
        return false;
}
bool CTime::operator <= (CTime &t)
{
    if (hour < t.hour)
        return true;
    else if (hour == t.hour && minute < t.minute)
        return true;
    else if (minute == t.minute && second <= t.second)
        return true;
   else
        return false;
}
bool CTime::operator==(CTime &t)
{
    if (hour==t.hour&&minute==t.minute&&second==t.second)
        return true;
    else
        return false;
}
bool CTime::operator != (CTime &t)
{
    if (hour == t.hour && minute == t.minute && second == t.second)
        return false;
    else
        return true;
}
CTime CTime::operator+(CTime &c)
{
    CTime ct(*this);

    if (ct.second + c.second >= 60)
    {
        ct.second = ct.second + c.second - 60;
        ++ct.minute;
   }
    else
        ct.second =  ct.second + c.second;
    if (ct.minute + c.minute >= 60)
    {
        ct.minute = ct.minute + c.minute - 60;
        ++ct.hour;
    }
    else
        ct.minute = ct.minute + c.minute;
    if (ct.hour + c.hour >= 60)
        ct.hour = ct.hour + c.hour - 60;
    else
       ct.hour = ct.hour + c.hour;
    return ct;
}
CTime CTime::operator-(CTime &c)
{
    CTime ct(*this);
    if (ct.second < c.second)
    {
        --ct.minute;
        ct.second = ct.second + 60 - c.second;
    }
    else
        ct.second = ct.second - c.second;
    if (ct.minute < c.minute)
    {
        --ct.hour;
        ct.minute = ct.minute + 60 - c.minute;
    }
    else
        ct.minute = ct.minute - c.minute;
    if (ct.hour < c.hour)
        ct.hour = ct.hour + 24 - c.hour;
    else
        ct.hour = ct.hour - c.hour;
    return ct;
}
CTime CTime::operator+(int s)
{
    CTime ct;
    ct.hour = s / 3600;
    s = s % 3600;
    ct.minute = s / 60;
    ct.second = s % 60;
    return (*this + ct);
}
CTime CTime::operator-(int s)
{
    CTime ct;
    ct.hour = s / 3600;
   s = s % 3600;
   ct.minute = s / 60;
    ct.second = s % 60;
    return (*this - ct);
}
CTime CTime::operator++(int)
{
    CTime tp(*this);
    *this = *this + 1;
    return tp;
}
CTime CTime::operator++()
{
    return (*this = *this + 1);
}
CTime CTime::operator--(int)
{
    CTime tp(*this);
    *this = *this - 1;
    return tp;
}
CTime CTime::operator--()
{
    return (*this = *this - 1);//需要改变其值
}
CTime CTime::operator+=(CTime &c)
{
    return (*this = *this + c);
}
CTime CTime::operator-=(CTime &c)
{
    return (*this = *this - c);
}
CTime CTime::operator+=(int s)
{
    return (*this = *this + s);
}
CTime CTime::operator-=(int s)
{
    return (*this = *this - s);
}
void main()
{
    //CTime t1(8, 20, 25), t2(11, 20, 50), t;
    CTime t1, t2, t;
    cin >> t1 >> t2;
    cout << "t1为：" << t1 << endl;
    cout << "t2为：" << t2 << endl;
    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;
    cout << endl;
    //下面自行设计对其他运算符的重载的测试
    t = t1 + t2;
    cout << "t1+t2=" << t << endl;
    t = t1 - t2;
    cout << "t1-t2=" << t << endl;
       t2 = t2 - 365;
    cout << "t2前进365秒。t2-365=" << t2 << endl;
    t1 = t1 + 3;
    cout << "t1后退3秒。t1+3=" << t1 << endl;
    cout << "++t1=" << ++t1 << endl;
    cout << "t1=" << t1 << endl;
    cout << "--t1=" << --t1 << endl;
    cout << "t1=" << t1 << endl;
    cout << "t2++=" << t2++ << endl;
    cout << "t2=" << t2 << endl;
    cout << "t2--=" << t2-- << endl;
   cout << "t2=" << t2 << endl;
  }

运行结果：