C Program to Check Leap Year
A leap year is a calendar year in which an additional day is added to February month. In a leap year, the number of days in February month and the year are 29 and 366 respectively. A year that is not a leap year is called a common year. A year is said to be a leap year if
- it is divisible by 4.
- it is divisible by 4 but not divisible by 100.
- it is divisible by 4, 100 and 400.
Method 1: Using conditional statements
In the example below, conditional statements are used to identify a leap year.
#include <stdio.h> int main() { int year = 2019; if (year % 400 == 0) { printf("%i is a leap year.", year); } else if (year % 100 == 0) { printf("%i is not a leap year.", year); } else if (year % 4 == 0) { printf("%i is a leap year.", year); } else { printf("%i is not a leap year.", year); } }
The above code will give the following output:
2019 is not a leap year.
Method 2: Using function
In the example below, a function called leapyear() is created which takes year as argument and prints whether the passed year is a leap year or not.
#include <stdio.h> static void leapyear(int); static void leapyear(int year) { if (year % 400 == 0) { printf("%i is a leap year.", year); } else if (year % 100 == 0) { printf("%i is not a leap year.", year); } else if (year % 4 == 0) { printf("%i is a leap year.", year); } else { printf("%i is not a leap year.", year); } } int main() { leapyear(2019); }
The above code will give the following output:
2019 is not a leap year.
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