c programming

/*
Program to Convert Time in Seconds to Hours, Minutes and Seconds
*/
#include <stdio.h>
main()
{
long sec, hr, min, t;
printf("\nEnter time in seconds: ");
scanf("%ld", &sec);
hr = sec/3600;
t = sec%3600;
min = t/60;
sec = t%60;
printf("\n\nTime is %ld hrs %ld mins %ld secs", hr, min, sec);
getch();
}
hr = sec/3600;
This program follows the general logic of converting second to hour.ie divide the total second by 3600 thus we get the Hour,
 t = sec%3600
Then make a modular division on the total second ,thus we get the remaining seconds that can not form a hour.
min = t/60;
divide the 't' (seconds)with 60 ,then we get the remaining minutes.
sec = t%60;
modular division on the 't' result in the remaining seconds....