#include <iostream>
#include <stdio.h>
using namespace std;
class worktime
{
friend ostream &operator<<( ostream&, const worktime & );
friend istream &operator>>( istream&, worktime & );
private:
int hour;
int minute;
public:
worktime(int hr=0,int mi=0 );
void set_time(int hr,int mi);
void set_hour(int hr);
void set_minute(int mi);
worktime operator+(const worktime &time);
};
worktime::worktime(int hr,int mi)
{
set_time(hr,mi);
}
void worktime::set_time(int hr,int mi)
{
set_hour(hr);
set_minute(mi);
}
void worktime::set_hour(int hr)
{
if(hr>0)
hour=hr;
else
hour=0;
}
void worktime::set_minute(int mi)
{
minute = ( mi >= 0 && mi < 60 ) ? mi : 0;
}
worktime worktime::operator+(const worktime &time1)
{
worktime time(0,0);
minute=minute+time1.minute;
if(minute>=60)
{
time.minute=minute%60;
time.hour=hour+(minute/60)+time1.hour;
}
else
{
time.hour=hour+time1.hour;
time.minute=minute;
}
return time;
}
ostream &operator<<( ostream &output, const worktime &time )
{
output << time.hour << ":"<<time.minute;
return output;
}
istream &operator>>( istream &input, worktime &time )
{
input>>time.hour>>time.minute;
return input;
}
int main()
{
worktime time;
worktime time1(2,30);
worktime time2(0,0);
cout<<"first time:";
cin>>time;
cout<<time<<endl;
cout<<"new time:";
time2=time+time1;
cout<<time2;
return 0;
}