例4.6.doc

铁道出版社出版的C++的习题源代码

#include<iostream.h>
class Time
{
public:
	Time(){minute=0;sec=0;}
	Time(int m,int s):minute(m),sec(s){}
	Time operator++();
	Time operator++(int);
	void display(){cout<<minute<<":"<<sec<<endl;}
private:
	int minute;
	int sec;
};
Time Time::operator++()
{
	if(++sec>=60)
	{
		sec-=60;
		++minute;
	}
	return *this;
}
Time Time::operator++(int)
{
	Time temp(*this);
	sec++;
	if(sec>=60)
	{
		sec-=60;
		++minute;
	}
	return temp;
}

int main()
{
	Time time1(34,59),time2;
	cout<<"time1:";
	time1.display();
	++time1;
	cout<<"++time1:";
	time1.display();
	time2=time1++;
	cout<<"time1++:";
	time1.display();
	cout<<"time2:";
	time2.display();
	return 0;
}