C program to check leap year using Conditional operator

Write a C program to input a year and check whether year is leap year or not using conditional/ternary operator ?:. How to check leap year using conditional operator in C programming.

Example

Input

Input year: 2016

Output

2016 is Leap Year

Required knowledge

Basic C programming, Conditional operator, Logical operators

Learn more - Program to check leap year using if...else

Leap year condition

If a year is exactly divisible by 4 and not divisible by 100 then its Leap year.
Else if year is exactly divisible 400 then its Leap year.
Else its a Common year.

Program to check leap year

/**
 * C program to check leap year using conditional operator
 */

#include <stdio.h>

int main()
{
    int year;
 
    /*
     * Input year from user
     */
    printf("Enter any year: ");
    scanf("%d", &year);

    /*
     * If year%4==0 and year%100==0 then
     *     print leap year
     * else if year%400==0 then
     *     print leap year
     * else
     *     print common year 
     */
    (year%4==0 && year%100!=0) ? printf("LEAP YEAR") :
        (year%400 ==0 ) ? printf("LEAP YEAR") : printf("COMMON YEAR");

    return 0;
}

Note: Another approach of writing the same program.

/**
 * C program to check leap year using conditional operator
 */

#include <stdio.h>

int main()
{
    int year;
 
    /*
     * Input year from user
     */
    printf("Enter any year: ");
    scanf("%d", &year);

    printf("%s", ((year%4==0 && year%100!=0) ? 
                    "LEAP YEAR" : (year%400 ==0 ) ? 
                        "LEAP YEAR" : "COMMON YEAR"));

    return 0;
}

Output

Enter any year: 2016
LEAP YEAR

Happy coding 😉

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