C Leap year or Not

What Is A Leap Year?

A leap year is a year which has 366 days, as opposed to a common year which has 365 days only. Neary leap year comes once in every four years.

Why Leap Years?

Earth takes approximately 365.242189 days or 365 day, 5 hours, 48 minutes and 45 seconds to revolve once around the Sun.

But, as per Gregorian calender we has only 365 day and we will lose nearly 6 hours every year ie) 4 years * 6 hours = 24 hours = 1 day. Thus leap year is added to our calender on February 29.

Logic To Find Leap Year

• The year can be evenly divisible by 4
• If the year can be evenly divisible by 100, then it is not a leap year.
• The year can alse be evenly divisible by 400. then it is also a leap year.

C Program - Leap Year or Not

Let us write a C program to find a user entered year is leap or not.

#include <stdio.h>
int main()
{
int year;
printf("\nEnter the year : ");
scanf("%d",&year);
if((year % 4 == 0 && ( year % 100 != 0 || year % 400 == 0)))
{
printf("\n%d is a leap year", year);
}
else
{
printf("\n%d is not a leap year", year);
}
return 0;
}

Enter the year : 2016
2016 is a leap year

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