C# Program to Check Leap Year

January 19, 2021 1:24 pm IST

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What is Leap Year?

A leap year is a calendar year containing one additional day added to keep the calendar year synchronized with the astronomical or seasonal year. For example, 2024 is a leap year.

Tips: It is recommended to use our online Leap Year calculator for better understanding.

Condition for Leap Year

To check whether a year is a leap year or not, the year should satisfy at least one of the following two conditions

A year should be exactly divisible by 4, but, not by 100.
A year should be exactly divisible by 4, 100 and 400 at the same time.

Check Leap Year

In the following example, we will check whether the given year (2012) is leap year or not.

Example

C# Compiler

using System; namespace myApp { class Program { static void Main(string[] args) { int year = 2012; if(year % 4 == 0) { if((year % 100 == 0) && (year % 400 != 0)) Console.Write("{0} is not a leap year", year); else Console.Write("{0} is a leap year", year); } else Console.Write("{0} is not a leap year", year); } } }

Output

2012 is a leap year

Leap Years between the Given Range

In the following example, we will find all the Leap Years between 2000 and 2030.

Example

C# Compiler

using System; namespace myApp { class Program { static void Main(string[] args) { int start = 2000; int end = 2030; Console.WriteLine("Leap years between 2000 and 2030:"); for(start=start; start<=end; start++) { if(start % 4 == 0) { if((start % 100 == 0) && (start % 400 != 0)) { // Not a leap year } else Console.Write(start+" "); } } } } }

Output

Leap years between 2000 and 2030: 2000 2004 2008 2012 2016 2020 2024 2028

Check Leap Year for any Given Year

In the following example, we will check whether the given year is a leap year or not.

Example

C# Compiler

using System; namespace myApp { class Program { static void Main(string[] args) { Console.Write("Enter a year: "); int year = Convert.ToInt32(Console.ReadLine()); if(year % 4 == 0) { if((year % 100 == 0) && (year % 400 != 0)) Console.Write("{0} is not a leap year", year); else Console.Write("{0} is a leap year", year); } else Console.Write("{0} is not a leap year", year); } } }