9_3.cpp

vc++的实验和实训例子非常适合初学者学习和阅读

#include<iostream.h>
class Time
{
	int hour,minute,second;
public:
	Time(){};
	Time(int h,int m,int s)
	{
		hour=h;minute=m;second=s;
	}
	Time(int h,int m)
	{
		hour=h;minute=m;second=0;
	}
	Time(int h)
	{
		hour=h;minute=0;second=0;
	}
	void sethour(int h){hour=h;}
	void setminute(int m){minute=m;}
	void setsecond(int s){second=s;}
	int gethour(){return hour;}
	int getminute(){return minute;}
	int getsecond(){return second;}
	Time operator+(Time);
	Time operator-(Time);
	void disp()
	{
		cout<<hour<<":"<<minute<<":"<<second<<endl;
	}
};
Time Time::operator+(Time t)
{
	int carry,hh,mm,ss;
	ss=getsecond()+t.getsecond();
	if(ss>60)
	{
		ss-=60;
		carry=1;
	}
	else carry=0;
	mm=getminute()+t.getminute()+carry;
	if(mm>60)
	{
		mm-=60;
		carry=1;
	}
	else carry=0;
	hh=gethour()+t.gethour()+carry;
	if(hh>24)
		hh-=24;
	static Time result(hh,mm,ss);
	return result;
}
Time Time::operator-(Time t)
{
	int borrow,hh,mm,ss;
		ss=getsecond()-t.getsecond();
	if(ss<0)
	{
		ss+=60;
		borrow=1;
	}
	else borrow=0;
	mm=getminute()-t.getminute()-borrow;
	if(mm<0)
	{
		mm+=60;
		borrow=1;
	}
	else borrow=0;
	hh=gethour()-t.gethour()-borrow;
	if(hh<0)
		hh+=24;
	static Time result(hh,mm,ss);
	return result;
}
void main()
{
	Time now(17,35,20);
	Time start(17,55);
	Time t1=now-start,t2=now+start;
	cout<<"输出结果为："<<endl;
	cout<<"now:";
	now.disp();
	cout<<"start:";
	start.disp();
	cout<<"相差：";t1.disp();
	cout<<"相加：";t2.disp();
}