第9周-运算符重载(二)-Time类中运算符重载(续)

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/* * Copyright (c) 2014, 烟台大学计算机学院 * All rights reserved. * 文件名称:test.cpp * 作    者:刘畅 * 完成日期:2015 年 5  月  5 日 * 版 本 号:v1.0 * * 问题描述:(1)定义对时间对象的自增和自减一目运算符(2)定义Time类中的<<和>>运算符重载,实现时间的输入输出,改造原程序中对运算结果显示方式,使程序读起来更自然。* 输入描述: ;* 程序输出: 按要求输出。

代码如下:

#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();    //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);    //二目的加减运算符的重载    //返回t规定的时,分,秒后的时间    //例t1(8,20,25),t2(11,20,50),t1+t2为19:41:15    CTime operator+(CTime &t);    CTime operator-(CTime &t);    CTime operator+(int s);    CTime operator-(int s);    //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    //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    friend istream& operator >> (istream& input, CTime& c);    friend ostream& operator << (ostream& output,const CTime& c);};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;}void CTime::display(){    cout<<hour<<':'<<minute<<':'<<second<<endl;}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;    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;    return false;}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||*this<t)        return false;    return true;}bool CTime::operator != (CTime &t){    if (*this==t)        return false;    return true;}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-=60;        m++;    }    if (m>59)    {        m-=60;        h++;    }    if (h>23)        h-=24;    CTime t0(h,m,s);    return t0;}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<0) h+=24;    CTime t0(h,m,s);    return t0;}CTime CTime::operator+(int s){    int s1=s%60;    int m1=(s/60)%60;    int h1=s/3600;    CTime t0(h1,m1,s1);    return *this+t0;}CTime CTime::operator-(int s){    int s1=s%60;    int m1=(s/60)%60;    int h1=s/3600;    CTime t0(h1,m1,s1);    return *this-t0;}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;}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--(){    *this=*this-1;    return *this;}istream& operator >> (istream& input,  CTime & c){    int a,b,z;    char s,v;    do    {        input>>a>>s>>b>>v>>z;        if (s==':'&&v==':')            break;    }while(1);    c.hour=a;    c.minute=b;    c.second=z;    return input;}ostream& operator << (ostream& output,const  CTime& c){    output<<c.hour<<':'<<c.minute<<':'<<c.second<<endl;    return output;}int main(){    CTime t1(8,20,25),t2,t3;    cout<<"t1: ";    cout<<t1;    cout<<"t2: ";    cin>>t2;    cout<<t2;    cout<<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;    cout<<endl;    cout<<"t=t1++"<<endl;    t3=t1++;    cout<<"t3= "<<t3<<"t1= "<<t1<<endl;    cout<<"t=++t1"<<endl;    t3=++t1;    cout<<"t3= "<<t3<<"t1= "<<t1<<endl;    cout<<endl;    t3=t1+t2;    cout<<t3;    t3=t1-t2;    cout<<t3;    t3=t1+3000;    cout<<t3;    t3=t1-4800;    cout<<t3;    t1+=t2;    cout<<t1;    t1-=t2;    cout<<t1;    t1+=3000;    cout<<t1;    t1-=4800;    cout<<t1;    return 0;}


运行结果:


 

学习心得:

只是在原来的代码基础上加了六个函数,修改了一下主函数而已,发现这几个函数掌握了,写的前面的那堆函数的东西又忘怎么写了。。。

这个题目碰到了一个问题,当":"冒号我输中文格式的时候,运行窗口它就卡死在那里,不能输入,也没有输出。中文格式的字符都不可以。其它的字符就行,这是为何?

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