46 : C Program to Check Entered Number is a Leap Year or not

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What is a leap year ?

Earth takes 365.242199 days to complete its orbit around the sun. So we have leap years. A Leap year has 366 days (i.e febuary with 29 days as 1 day is added every 4th year) is called as a leap year. This happens every 4th year.

Note : To get to more closer to 365.242199 days/year, every 100th year is not a leap year!! Where as every 400th year is a leap year!

Logic to find leap year in C

Every 4th year is a leap year. And number divisible by 400 is a leap year, But number divisible by 100 is not a leap year! This can be achieved using if condition and modulo division with conditions like, 


if ((year % 400 == 0) || ( ( year % 100 != 0) && (year % 4 == 0 ))) {
       
      //Leap year!
   }
   else {
       
       //Not a leap year!
   }


Variables :

year : Datatype int : Holds value of year inputted by the user. %d is the Format specifier for int's








/*
 * 1000+ C programs + tutorials
 *
 * 
 * 41_Check_entered_year_is_a_leapyear.c
 *
 *
 *  Created on: Oct 20, 2014
 *  Author: Code2care.org
 */

#include 
//#include 



void main() {

int year;
  

//clrscr();

    printf("C Program to Find Entered Year is a leap year or not.");

    printf("\n\n Enter Number : ");
    scanf("%i", &year);

    

     
     
  //Logic to check leap year

   if ((year % 400 == 0) || ( ( year % 100 != 0) && (year % 4 == 0 ))) {
       
       printf("\n\n %i is a leap year!",year);
   }
   else {
       
       printf("\n\n %i is not a leap year!!",year);
   }
   
  

//getch();


}








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