前缀++和后缀++重载.txt

//时钟++运算符重载
//++time 和 time++
#include<iostream>
#include<string>
class Clock
{
private:
	int hour;
	int minute;
	int second;
public:
	Clock(int a=0,int b=0,int c=0)
	{
		if (a >= 0 && b >= 0 && c >= 0 && a < 24 && b < 60 && c < 60)
		{
			hour = a;
			minute = b;
			second = c;
		}
		else
		{
			std::cout << "输入错误,重置为0" << std::endl;
			hour = 0;
			minute = 0;
			second = 0;
		}
	}
	void display()
	{
		std::cout << hour << ":" << minute << ":" << second << std::endl;
	}
	Clock& operator++()//++Clock
	{
		second++;
		if (second >= 60)
		{
			second -= 60;
			if (++minute >= 60)
			{
				minute -= 60;
				hour=(++hour)%24;
			}
		}
		return *this;
	}
	Clock operator ++(int)//Clock++,后缀++的标识是参数为int
	{
		Clock old = *this;
		++(*this);
		return old;
	}
};
int main()
{
	Clock a{ 12,59,59 };
	(a++).display();
	a.display();
	(++a).display();
	a.display();
}
//参考CPlusPlusThings