Q. Write a program to check whether the given year is leap year or not.



Leap year :- A leap year is a calendar year that contains an additional day added to keep the calendar year synchronized. A leap year is exactly divisible by 4, except for the century years (the years ending with 00). Century year is a leap year only if it is completely divisible by 400.

For Example:-
Input = 1999
Output = 1999 is not a leap year
So as we can see that 1999 is not a leap year because 1999 is not divisible by 4.

Leap Year Algorithm

START
   Step 1 → Initialize variable year
   Step 3 → Check if year is divisible by 4 but not by 100, DISPLAY "leap year"
   Step 4 → Check if year is divisible by 400, DISPLAY "leap year"
   Step 5 → Otherwise, DISPLAY "not leap year"
STOP


Leap Year Program

  • C
  • C++
  • Java
  • Python
  • C#
  • PHP
  • #include <stdio.h>
    int main() {
        int check_year=1998;
        if (check_year % 4 == 0) {
            if (check_year % 100 == 0) {
                // the check_year is a leap year if it is divisible by 400.
                if (check_year % 400 == 0)
                    printf("%d is a leap year.", check_year);
                else
                    printf("%d is not a leap year.", check_year);
            } else
                printf("%d is a leap year.", check_year);
        } else
            printf("%d is not a leap year.", check_year);
    
        return 0;
    }
    
    #include <bits/stdc++.h>
    using namespace std; 
    
    int main()
    {
        int check_year=1998;
    
        if (check_year % 4 == 0)
        {
            if (check_year % 100 == 0)
            {
                if (check_year % 400 == 0)
                    cout << check_year << " is a leap year.";
                else
                    cout << check_year << " is not a leap year.";
            }
            else
                cout << check_year << " is a leap year.";
        }
        else
            cout << check_year << " is not a leap year.";
    
        return 0;
    }
    
    public class Main {
    
        public static void main(String[] args) {
    
            int check_year = 1998;
            boolean leap = false;
    
            if(check_year % 4 == 0)
            {
                if( check_year % 100 == 0)
                {
                    // check_year is divisible by 400, hence the check_year is a leap year
                    if ( check_year % 400 == 0)
                        leap = true;
                    else
                        leap = false;
                }
                else
                    leap = true;
            }
            else
                leap = false;
    
            if(leap)
                System.out.println(check_year + " is a leap year.");
            else
                System.out.println(check_year + " is not a leap year.");
        }
    }
    
    # Python program to check if year is a leap year or not
    
    check_year = 1998
    
    # To get year (integer input) from the user
    # check_year = int(input("Enter a year: "))
    
    if (check_year % 4) == 0:
       if (check_year % 100) == 0:
           if (check_year % 400) == 0:
               print("{0} is a leap year".format(check_year))
           else:
               print("{0} is not a leap year".format(check_year))
       else:
           print("{0} is a leap year".format(check_year))
    else:
       print("{0} is not a leap year".format(check_year)) 
      
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
     
    namespace Program
    {
        class leapyear
        {
            static void Main(string[] args)
            {
                leapyear obj = new leapyear();
                obj.readdata();
                obj.leap();
            }
            int check_year;
            public void readdata()
            {
                
                check_year = 1998;
            }
            public void leap()
            {
                if ((check_year % 4 == 0 && check_year % 100 != 0) || (check_year % 400 == 0))
                {
                    Console.WriteLine("{0} is a Leap Year", check_year);
                }
                else
                {
                    Console.WriteLine("{0} is not a Leap Year", check_year);
                }
                Console.ReadLine();
            }
        }
    }
    
    function isLeap($check_year)  
    {  
        return (date('L', mktime(0, 0, 0, 1, 1, $check_year))==1);  
    }  
    //For testing  
    $check_year=1998;
        If (isLeap($check_year))  
        {  
            echo "$check_year is a Leap Year\n";  
        }  
        else  
        {  
            echo "$check_year is not a Leap Year\n";  
        }  
      
    
    #include <stdio.h>
    int main() {
        int check_year=1998;
        if (check_year % 4 == 0) {
            if (check_year % 100 == 0) {
                // the check_year is a leap year if it is divisible by 400.
                if (check_year % 400 == 0)
                    printf("%d is a leap year.", check_year);
                else
                    printf("%d is not a leap year.", check_year);
            } else
                printf("%d is a leap year.", check_year);
        } else
            printf("%d is not a leap year.", check_year);
    
        return 0;
    }
    

    Output

    1998 is not a leap year.
    

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