C Program to find leap year or not

This program to finds whether the given year is leap year or not

#include<stdio.h>

#include<math.h>

main() {

    int year, b;

    printf("Enter the year\t");

    scanf("%d", &year);

    b = year % 4;

    if(b == 0) {

        printf("the given year %d is leap year\n", year);

    } else {

        printf("the given year %d is not leap year\n", year);

    }

}

Output:--
Enter the year   2021
the given year 2011 is not leap year

How it works

It finds whether the input year is divisible by 4 or not. If it remainder is 0 then it treats as a leap year and shows this year is leap year else shows given year is not leap year.