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C Program to check Leap Year 

 This 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

Let’s 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