prog9.cpp

来自「C++语言程序设计题典」· C++ 代码 · 共 89 行

#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;    //进位标记
	}
	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;    //借位标记
	}
	else borrow=1;
	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(2,24,39);
	Time start(17,55);
	Time t1=now-start,t2=now+start;
	cout << "输出结果:" << endl;
	cout << "  now:  ";now.disp();
	cout << "  start:";start.disp();
	cout << "  相差: ";t1.disp();
	cout << "  相加: ";t2.disp();
}