重载单目运算符

#include <iostream>
#include <string.h>
//#include <cmath>
//#include <iomanip>

using namespace std;
class Time
{
public:
    Time(){minute=0;sec=0;}
    Time (int m,int s):minute(m),sec(s){}
    Time operator++();
    void display(){cout<<minute<<":"<<sec<<endl;}
private:
    int minute;
    int sec;
};
Time Time::operator++()
{
    if(++sec>=60)
    {
        sec-=60;
        ++minute;
    }
        return *this;
}
int main()
{
    Time time1(34,0);
    for(int i=0;i<61;i++)
    {
        ++time1;
        time1.display();
    }
    return 0;
}