123.cpp

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#include <iostream>
using namespace std;

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);
    //Time temp;
    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;
}