C Program To Check Leap Year or Not using Function

Any year is entered through the keyboard. Write a function to determine whether the year is a leap year or not.

Related Read:
C Program To Check Leap Year

Video Tutorial: C Program To Check Leap Year or Not using Function

Source Code: C Program To Check Leap Year or Not using Function

#include<stdio.h>
#include<stdbool.h>

bool leap(int); // function prototype

int main()
{
    int year;

    printf("Enter a year to find leap year or not\n");
    scanf("%d", &year);

    //function call leap(year);
    if( leap(year) )
    {
        printf("%d is leap year\n", year);
    }
    else
    {
        printf("%d is not leap year\n", year);
    }

    return 0;
}

//function definition
bool leap(int year)
{
    if(year % 100 == 0)
    {
        if(year % 400 == 0)
            return true;
        else
            return false;
    }
    else
    {
        if(year % 4 == 0)
            return true;
        else
            return false;
    }
}

Output 1
Enter a year to find leap year or not
2020
2020 is leap year

Output 2
Enter a year to find leap year or not
2021
2021 is not leap year

Logic To Find Leap Year or Not: Using Function

If user entered year is a century year(year ending with 00) and the year is perfectly divisible by 400, then it’s a leap year.

If the user entered year is not a century year and the year is perfectly divisible by 4, then its a leap year orelse it’s not a leap year.

In our function, we return true if the user entered year is leap year and return false if the user entered year is not leap year.

Note: User defined function leap has a return type of bool i.e., it returns either true or false. For our C program to support bool type we are including stdbool.h header file.

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