第八周项目二:Time类中的运算符重载

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问题及代码:

/**Copyright (c)2014,烟台大学计算机与控制工程学院*All rights reserved.*文件名称: Time类中的运算符重载 .cpp*作    者:白云飞*完成日期:2015年4月25日*版 本 号:v1.0**问题描述:实现Time类中的运算符重载。*程序输入:无*程序输出: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);    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);//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;}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){    return !(*this<t);}bool CTime::operator <= (CTime &t){    return !(*this>t);}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)//对照+理解{    int s2,m2,h2;    s2=second-t.second;    m2=minute-t.minute;    h2=hour-t.hour;    if(s2<0)    {        s2+=60;        m2--;    }    if(m2<0)    {        m2+=60;        h2--;    }    if(h2<0)    {        h2+=24;    }    CTime t0(h2,m2,s2);    return t0;}CTime CTime::operator+(int s)//返回s秒后的时间{    int s1,m1,h1;    s1=s%60;    m1=(s/60)%60;    h1=s/3600;    CTime t1(s1,m1,h1);    return *this+t1;}CTime CTime::operator-(int s)//返回s秒前的时间{    int s2,m2,h2;    s2=s%60;    m2=(s/60)%60;    h2=s/3600;    CTime t2(h2,m2,s2);    return *this-t2;}//二目赋值运算符的重载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)//返回s秒后的时间{    *this=*this+s;    return *this;}CTime CTime::operator-=(int s)//返回s秒前的时间{    *this=*this-s;    return *this;}int main(){    CTime t1(8,20,25),t2(11,20,50),t;    cout<<"t1:";    t1.display();    cout<<"t2:";    t2.display();    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;    t.display();    t=t1-t2;    t.display();    t=t1+100;    t.display();    t=t1-100;    t.display();    t1+=t2;    t1.display();    t1-=t2;    t1.display();    t1+=100;    t1.display();    t1-=100;    t1.display();    return 0;}


运行结果:


学习心得:

代码中运算符重载函数有bool型,成员函数,参数有int型,还有类的成员。


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