C#: Check whether a given year is a leap year or not

Last update on August 20 2025 12:38:15 (UTC/GMT +8 hours)

Write a C# Sharp program to find out whether a given year is a leap year or not.

Visual Presentation:

Sample Solution:-

C# Sharp Code:

using System;  // Importing the System namespace

public class Exercise4  // Declaration of the Exercise4 class
{  
    public static void Main()  // Entry point of the program
    {
        int chk_year;  // Declaration of the integer variable chk_year
        Console.Write("\n\n");  // Printing new lines
        Console.Write("Check whether a given year is leap year or not:\n");  // Displaying the purpose of the program
        Console.Write("----------------------------------------------");  // Displaying a separator
        Console.Write("\n\n");  // Printing new lines
        Console.Write("Input an year : ");  // Prompting user to input a year
        chk_year = Convert.ToInt32(Console.ReadLine());  // Reading the input year from the user

        if ((chk_year % 400) == 0)  // Checking if the year is divisible by 400 without remainder
            Console.WriteLine("{0} is a leap year.\n", chk_year);  // Printing a message if it's a leap year
        else if ((chk_year % 100) == 0)  // Checking if the year is divisible by 100 without remainder
            Console.WriteLine("{0} is not a leap year.\n", chk_year);  // Printing a message if it's not a leap year
        else if ((chk_year % 4) == 0)  // Checking if the year is divisible by 4 without remainder
            Console.WriteLine("{0} is a leap year.\n", chk_year);  // Printing a message if it's a leap year
        else
            Console.WriteLine("{0} is not a leap year.\n", chk_year);  // Printing a message if it's not a leap year
    }
}

Sample Output:

Check whether a given year is leap year or not:                                                               
----------------------------------------------                                                                                                         
Input an year : 2017                                                                                          
2017 is not a leap year.

Flowchart :

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