第八周-运算符重载-Time类中的运算符重载

标签：c++   类   博客   class   namespace   

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

};

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;
}

int main()
{
    CTime t1(8,20,25),t2(11,20,50),t3;
    cout<<"t1: ";
    t1.display();
    cout<<"t2: ";
    t2.display();
    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;
    t3=t1+t2;
    t3.display();
    t3=t1-t2;
    t3.display();
    t3=t1+3000;
    t3.display();
    t3=t1-4800;
    t3.display();
    t1+=t2;
    t1.display();
    t1-=t2;
    t1.display();
    t1+=3000;
    t1.display();
    t1-=4800;
    t1.display();
    return 0;
}

运行结果：

学习心得：

经过这个项目，感觉已经基本掌握了运算符重载的用法。棒棒哒。

第八周-运算符重载-Time类中的运算符重载

标签：c++   类   博客   class   namespace   

原文地址：http://blog.csdn.net/liuchang54/article/details/45268151