How to check if year is a leap year in java and C#

Hye there, its quite complicated to check in if else statement the year is a leap year or not.   Today i will show the example how to check if the year is a leap year or not.

Leap Year

• A Normal day for a year is 365 days
• Leap year have 366 days (29 days in february)

How to know if the year is  leap year

• Leap year can be any year that can be divided by 4 without any balance.

WHY leap year occur

• This is because according to research, The earth rotate about 365.242375
• but in one year only have 365 days.
• So something has to be done to handle the remaining 0.242375 balance. that is why the leap year occur only once in 4 years.

The example is pretty easy to follow.

The Java Application

package leapyear;

import java.util.Scanner;

public class LeapYear {
    
    public static void main(String[] args) {
        String Cont = "Y";
        Scanner input = new Scanner(System.in);
        LeapYear lYear = new LeapYear();
        
        System.out.println("---------------------------");
        System.out.println("Program to check if year is leap year or not");
        System.out.println("---------------------------");
        
        while(Cont.equalsIgnoreCase("Y")){
            
            System.out.println("Please Enter the year to check in format \"YYYY\"");
            String year = "";
            while(year.length() != 4){
                year = input.nextLine();
                if(year.length() != 4){
                    System.out.println("Please Enter the year in format \"YYYY\"");
                }               
            }
            System.out.println("Year " + year + " is a leap year : " + lYear.checkIfYearIsLeapYear(Integer.parseInt(year)));
            
            System.out.println("Do you want to check abother year?(Y,N)");
            Cont = input.nextLine();
            
        }
    }
    
    public boolean checkIfYearIsLeapYear(int iYear){
        if ((iYear % 400 == 0) || ((iYear % 4 == 0) && (iYear % 100 != 0))) {
            return true;
        } else {
            return false;
        }
    }
}

The C# Program

using System;
using System.Text;

namespace Check_LeapYear
{
    class Program
    {
        static void Main(string[] args)
        {
            String Cont = "Y";

            Program lYear = new Program();

            Console.WriteLine("---------------------------");
            Console.WriteLine("Program to check if year is leap year or not");
            Console.WriteLine("---------------------------");

            while (Cont.ToUpper().Equals("Y"))
            {

                Console.WriteLine("Please Enter the year to check in format \"YYYY\"");
                String year = "";
                while (year.Length != 4)
                {
                    year = Console.ReadLine();
                    if (year.Length != 4)
                    {
                        Console.WriteLine("Please Enter the year in format \"YYYY\"");
                    }
                }
                Console.WriteLine("Year " + year + " is a leap year : " + lYear.checkIfYearIsLeapYear(Convert.ToInt32(year)));

                Console.WriteLine("Do you want to check abother year?(Y,N)");
                Cont = Console.ReadLine();

            }
        }

        public bool checkIfYearIsLeapYear(int iYear)
        {
            if ((iYear % 400 == 0) || ((iYear % 4 == 0) && (iYear % 100 != 0)))
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
} 

The Output

---------------------------
Program to check if year is leap year or not
---------------------------
Please Enter the year to check in format "YYYY"
1989
Year 1989 is a leap year : false
Do you want to check abother year?(Y,N)
Y
Please Enter the year to check in format "YYYY"
89
Please Enter the year in format "YYYY"
2011
Year 2011 is a leap year : false
Do you want to check abother year?(Y,N)
Y
Please Enter the year to check in format "YYYY"
1996
Year 1996 is a leap year : true
Do you want to check abother year?(Y,N)
N

C# output

References

• mathsisfun

By Mohd Zulkamal
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