C Program to check Leap Year

June 5, 2021

his program checks whether the input year is leap year or not.

Example: Program to check Leap Year

You can check whether a year is leap or not by using this mathematical logic:
Leap Year:
If a year is divisible by 4, 100 and 400 then it is a leap year.
If a year is divisible by 4 but not divisible by 100 then it is a leap year

Not a Leap Year:
If a year is not divisible by 4 then it is not a leap year
If a year is divisible by 4 and 100 but not divisible by 400 then it is not a leap year

Lets write this logic in a C Program. To understand this program you should have the knowledge of following C Programming topic:

  • C Programming If..else, Nested if..else
#include <stdio.h>
int main()
{
    int y;

    printf("Enter year: ");
    scanf("%d",&y);

    if(y % 4 == 0)
    {
    	//Nested if else
        if( y % 100 == 0)
        {
            if ( y % 400 == 0)
                printf("%d is a Leap Year", y);
            else
                printf("%d is not a Leap Year", y);
        }
        else
            printf("%d is a Leap Year", y );
    }
    else
        printf("%d is not a Leap Year", y);

    return 0;
}

Output:

Enter year: 1991
1991 is not a Leap Year

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