时间的相加

#include <iostream>
using namespace std;
class Time
{
	private:
		int hour;
		int minute;
		int sec;
	public:
		Time();//声明一个无参的构造函数Time
		/*在声明构造函数时指定默认参数*/
		Time(int h,int m,int s):hour(h),minute(m),sec(s)//构造函数的重载，默认构造函数的初始化
		{}
		Time(const Time &);
		Time operator +(Time &t);//+运算符的重载
		friend ostream & operator<<(ostream &,Time &);//<<运算符的重载
		
		
};
Time::Time()//在类外定义无参构造函数
{
	hour=12;
	minute=10;
	sec=35;
}

Time::Time(const Time &b)
{
	hour=b.hour;
	minute=b.minute;
	sec=b.sec;
}

Time Time::operator + ( Time &t2)
{
	Time sum;
	sum.sec=sec+t2.sec;
	sum.minute=minute+t2.minute+sum.sec/60;
	sum.hour=hour+t2.hour+sum.minute/60;
	sum.minute%=60;
	sum.sec%=60;
	return sum;
}

ostream &operator <<(ostream &  output,Time & c)
{
	if(c.minute<10)
		output<<c.hour<<":"<<"0"<<c.minute<<":"<<c.sec;
	else if(c.sec<10)
		output<<c.hour<<":"<<c.minute<<":"<<"0"<<c.sec;
	else
		output<<c.hour<<":"<<c.minute<<":"<<c.sec;
	return output;
}

int main()
{
	Time t1(6,33,22);
	Time t2(12,34,23);
	Time total;
	total=t1+t2;
	cout<<t1<<"+"<<t2<<"="<<total<<endl;
	return 0;
}
<img src="https://img-blog.youkuaiyun.com/20160327225737923" alt="" />

实现时间的相加，能帮助我们更加深入的认识与对象类的应用，充分认识c++面向对象的程序设计