Time类中的运算符重载（续）

最新推荐文章于 2024-04-17 10:31:56 发布

原创最新推荐文章于 2024-04-17 10:31:56 发布 · 494 阅读

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CC 4.0 BY-SA版权

本文详细介绍了如何使用C++实现一个用于处理时间的类，包括构造、设置、显示时间，以及时间的比较、加减运算等功能。通过实例代码展示了如何灵活地进行时间的增减操作。

代码：

#include <iostream>
using namespace std;
class CTime
{
private:
    short int hour;
    short int minute;
    short int second;
public:
    CTime(int h=0,int m=0,int s=0);
    void setTime(int h,int m,int s);
    void display();
    bool operator > (CTime &t);
    bool operator < (CTime &t);
    bool operator >= (CTime &t);
    bool operator <= (CTime &t);
    bool operator == (CTime &t);
    bool operator != (CTime &t);

    CTime operator+(CTime &t);
    CTime operator-(CTime &t);
    CTime operator+(int s);
    CTime operator-(int s);
    CTime operator+=(CTime &c);
    CTime operator-=(CTime &c);
    CTime operator+=(int s);
    CTime operator-=(int s);

    CTime operator++(int);
    CTime operator++();
    CTime operator--(int);
    CTime operator--();

    friend istream &operator>>(istream &in,CTime &t);
    friend ostream &operator<<(ostream &out,CTime t);


};
istream& operator>>(istream& in,CTime&c)
{
    char m1,m2;
    while(1)
    {
        in>>c.hour>>m1>>c.minute>>m2>>c.second;
        if (m1==':' && m2==':')
            if (c.hour>-1 && c.hour<24 && c.minute>-1 && c.minute<60 && c.second>-1 && c.second<60) break;
        cerr<<"时间格式不正确! 请重新输入\n";
    }

    return in;

}
ostream &operator<<(ostream&output,CTime c)
{
    output<<c.hour<<':'<<c.minute<<':'<<c.second;
    return output;
}

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;

}

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;

}

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 + (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+(int s)
{
    int ss=s%60;
    int mm=(s/60)%60;
    int hh=s/3600;
    CTime t0(hh,mm,ss);
    return *this+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 ss=s%60;
    int mm=(s/60)%60;
    int hh=s/3600;
    CTime t0(hh,mm,ss);
    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++()
{
    *this=*this+1;
    return *this;
}
CTime CTime::operator++(int)
{
    CTime t;
    t=*this;
    *this=*this+1;
    return t;
}
CTime CTime::operator--()
{
    *this=*this-1;
    return *this;
}
CTime CTime::operator--(int)
{
    CTime t;
    t=*this;
    *this=*this-1;
    return t;
}
int main()
{
    CTime t1,t2,t;
    cout<<"t1为：";
    cin>>t1;
    cout<<"t2为：";
    cin>>t2;
    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;
    cout<<"t1= "<<t1<<endl;
    cout<<"t2= "<<t2<<endl;
    cout<<"t=t1++"<<endl;
    t=t1++;
    cout<<"t= "<<t<<"    t1= "<<t1<<endl;
    cout<<"t=++t1"<<endl;
    t=++t1;
    cout<<"t= "<<t<<"    t1= "<<t1<<endl;
    cout<<"t1+t2= "<<t1+t2<<endl;
    cout<<"t1-t2= "<<t1-t2<<endl;
    cout<<"t1+2000= "<<t1+2000<<endl;
    cout<<"t1-5000= "<<t1-5000<<endl;
    return 0;
}

运行结果：