Leap year - logic and Math

 

The algorithm or logic for Leap year is basically that:
1. A year is a leap year if it is divisible by 4 but not by 100.
2. If a year is divisible by both 4 and by 100, then it can only be a leap year if it is also divisible by 400.

 

#include <stdio.h>

int main()

{

    int year;

    printf("Enter a year: ");

    while(scanf("%d",&year)!=EOF)

    {

        if(year%4 == 0)

        {

            if( year%100 == 0) /* Checking for a century year */

            {

                if ( year%400 == 0)

                    printf("This is a leap year.\n");

                else

                    printf("This is an ordinary year.\n");

            }

            else

                printf("This is a leap year.\n");

        }

        else

        {

            printf("This is an ordinary year.\n", year);

        }

                printf("\nEnter a year: ");

    }

    return 0;

}