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C Program to Check Leap Year



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In this article, you will learn and get code about checking any given year is a leap year or not. Before going to the program, here is the formula to check whether the given year is a leap year or not.

To understad, from where this formula came, then refer to Leap Year Formula Explained. Now let's move on and implement it in a C program.

Leap Year Program in C

Now I'm sure that you have complete understading about what the leap year is and how it gets calculated. So its time to apply it in program:

// Leap Year Program in C
// ----codescracker.com----

#include<stdio.h>
#include<conio.h>
int main()
{
    int year;
    printf("Enter Year: ");
    scanf("%d", &year);
    if((year%4==0) && (year%100!=0))
        printf("\nIt's a Leap Year");
    else if(year%400==0)
        printf("\nIt's a Leap Year");
    else
        printf("\nIt's not a Leap Year");
    getch();
    return 0;
}

This program was compiled and executed using Code::Blocks IDE. Here is the first snapshot of sample run:

c program check leap year or not

Supply any year say 2100 as input and press ENTER key to see the output as shown in the snapshot given below:

leap year program c

It is a very simple program, you can easily understand it as all the logic used behind leap year is discribed in the early of this article. So let's move on the another program using function.

using Function

This program continue checking for leap year, until user wants to terminate it. Because here, we have added some extra code, so that user becomes able to check leap year for any number time at one run only. To check leap year, this program uses function. Let's have a look at it:

// Leap Year Program in C using Function
// ----codescracker.com----

#include<stdio.h>
#include<conio.h>
int checkLeapFun(int);
int main()
{
    int year, lORn;
    char choice='y';
    while(choice=='y')
    {
        printf("Enter Year: ");
        scanf("%d", &year);
        lORn = checkLeapFun(year);
        if(lORn == 0)
            printf("It's a Leap Year");
        else
            printf("It's not a Leap Year");
        printf("\n\nWant to check more ? (y/n): ");
        scanf(" %c", &choice);
        printf("\n");
    }
    getch();
    return 0;
}
int checkLeapFun(int yr)
{
    if((yr%4==0) && (yr%100!=0))
        return 0;
    else if(yr%400==0)
        return 0;
    else
        return 1;
}

Here is the sample run of above program:

c leap year program

In this way, you can continue checking until you want to terminate. To check for another year, just press y (for yes) and enter year. And to terminate it, just enter n (for no) or any other character except y.

Program Explained

Note - Use space before scanning the character as input, because %c conversion specifier won't automatically skip any leading whitespace. So, from previous entry, if there is a stray newline in input stream, the scanf() call will consume it immediately.

So here we have used

scanf(" %c", &choice);

as statement of scanning a character. Because the blank, in the format string tells scanf to skip any leading whitespace.

Same Program in Other Languages

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