time类中的运算符重载

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*文件名称:test.cpp

*作者: 武聪

*完成日期:2016年6月1日

*版本号:v1.0

*问题描述:

*输入描述:

*程序输出:

#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);
//输入输出运算的重载
friend istream &operator>>(istream &in,CTime &t);
friend ostream &operator<<(ostream &out,CTime t);
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);
//一目运算符的重载
CTime operator++(int);
CTime &operator++();
CTime operator--( int);
CTime &operator--();
};
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;
}
istream &operator>>(istream &in,CTime &t)
{
char ch1,ch2;
while(1)
{
cout<<"请输入时间(hh:mm:ss) ";
cin>>t.hour>>ch1>>t.minute>>ch2>>t.second;
if (ch1==':' && ch2==':')
if (t.hour>-1 && t.hour<24 && t.minute>-1 && t.minute<60 && t.second>-1 && t.second<60) break;
cerr<<"时间格式不正确! 请重新输入\n";
}
return cin;
}
ostream &operator<<(ostream &out,CTime t)
{
out<<t.hour<<':'<<t.minute<<':'<<t.second;
return out;
}

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;
if(second<t.second)
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;
if(second>t.second)
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 ss=s%60;
int mm=(s/60)%60;
int hh=s/3600;
CTime t0(hh,mm,ss);
return *this+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++(int)
{
CTime t=*this;
*this=*this+1;
return *this;
}
CTime& CTime::operator++()
{
*this=*this+1;
return *this;
}
CTime CTime::operator--(int)
{
CTime t=*this;
*this=*this-1;
return *this;
}
CTime& CTime::operator--()
{
*this=*this-1;
return *this;
}
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:

知识点总结:

运算符的重载

学习心得:
好好努力

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