Program in C language to check whether a year is a leap year or not a leap year using if-else. In this article, we will create a program to check whether a  year is a leap year or not. If you want to learn the ‘C’ language check this tutorial https://codedec.com/course/c-programming-tutorial/

What is a leap year?

As you all know, a year that occurs after every four years and which has 366 days is called a Leap year.

Algorithm

• Declare a variable year.
• After that, take input with the help of scanf function.
• Check the following condition
  • If the year is divisible by 400, it is a leap year.
  •  If the year is not divisible by 400, but by 100, it is not a leap year.
  • If the year is not divisible by 100, but by 4, it is a leap year.
• Then print output with a suitable/appropriate message.

C program to check whether a year is leap year or not a leap year

#include<stdio.h>
       void main(){
 int a; 
 printf("enter a value");
 scanf("%d",&a);
   if(a % 400 == 0){                                                                       	               
              	printf("%d is a leap year",a);
          }
  else if (a % 100 == 0) {
   printf("%d is not a leap year",a);	
        } 
        else if (a % 4 == 0) {
        	printf("%d is a leap year",a);
    }
    else {
    	printf ("%d is not a leap year",a);
    }
 }

Explanation of the source code

Step 1: Start.

Step 2: Add header files of Standard Input/Output using #include.

Step 3: Then create the main function method which is the starting point of the program execution.

Step 4: After that, declare a variable as “int a”.

Step 5: Take an input with the help of scanf function. Put & before variable in scanf() function. 

Step 6: Then check the following conditions

• First condition is if (a%400==0) then print using printf() method.
• Second condition is if else (a%100==0) then print using printf() method.
• Third condition is if else (a%4==0) then print using printf() method.
• The fourth and last condition is else then print using printf() method.

Step 7: Now execute the program and check whether it is a leap year or not a leap year with a suitable message.

Step 8: End.

Output

Thus, this is how we create a program in C to check whether a year is a leap year or not using the if-else block.