from seconds to h:mm:ss

seconds.cpp

#include <iostream>
using namespace std;
int
main ()
{
  int sec;		
  cin >> sec;
  int hour = 3600;	
  int min = 60;			
  hour = sec / hour;
  min = (sec - (hour * 3600)) / min;
  sec = sec - ((hour * 3600) + (min * 60));
  if (min >= 10 && sec >= 10)
    {
      cout << hour << ":" << min << ":" << sec;
    }				// ??????? ??????????
  else if (hour >= 24 && min >= 10 && sec > 10)
    {
      cout << hour - 24 << ":" << min << ":" << sec;
    }
  else if (hour < 24 && min < 10 && sec < 10)
    {
      cout << hour << ":" << 0 << min << ":" << 0 << sec;
    }				// ?? if
  else if (hour >= 24 && min < 10 && sec < 10)
    {
      cout << hour - 24 << ":" << 0 << min << ":" << 0 << sec;
    }
  else if (hour < 24 && min < 10 && sec >= 10)
    {
      cout << hour << ":" << 0 << min << ":" << sec;
    }
  else if (hour >= 24 && min < 10 && sec >= 10)
    {
      cout << hour - 24 << ":" << 0 << min << ":" << sec;
    }
  else if (hour < 24 && min >= 10 && sec <= 10)
    {
      cout << hour << ":" << min << ":" << 0 << sec;
    }
  else if (hour >= 24 && min >= 10 && sec <= 10)
    {
      hour -= 24;
      cout << hour - 24 << ":" << min << ":" << 0 << sec;
    }

  return 0;
}