Java Program to Check Odd or Even Numbers

  • Write a Java program to check whether a number is odd or even.
  • Java program to check even and odd integers.

To find whether a number is odd or even, we will check whether given number is completely divisible by 2 or not. Every even number can be represented as (2*N) whereas every odd number can be represented as (2*N + 1).

How to check whether a number is odd or even ?
  • If a number is divisible by 2, then it is an even number.
  • If a number is not divisible by 2, then it is an odd number.
For Example :
8%2 = 0 (8 is even number)
9%2 = 1 (9 is odd number)

Java program to check whether a number is Odd or Even

In this program, we first take an integer as input from user and store it in a variable "num". Then using an if-else statement we check whether "num" is divisible by 2 or not. If "num" is completely divisible by 2 then it is an even number otherwise odd.

package com.tcc.java.programs;

import java.util.Scanner;
/**
 * Java Program to check whether a number is odd or even
 */
public class EvenOddNumberCheck {
    public static void main(String[] args) {
        int num;
        Scanner scanner;
        // Take an integer from user
        scanner = new Scanner(System.in);
        System.out.println("Enter an Integer");
        num = scanner.nextInt();

        /*
         * Using if-else statement check whether num is divisible 
         * by 2 or not.
         */
        if (num % 2 == 0) {
            // num is even
            System.out.println(num + " is Even Number");
        } else {
            // num is odd
            System.out.println(num + " is Odd Number");
        }
    }
}
Output
Enter an Integer
5
5 is Odd Number
Enter an Integer
4
4 is Even Number

Java program to check Odd or Even numbers using function

This program is similar to above program except it uses a method "isEven" which takes an integer as argument and returns true if passed number is even otherwise odd. The advantage of writing a separate function to check odd and even number is that we can call this function from several different places eliminating redundancy.

package com.tcc.java.programs;

import java.util.Scanner;

/**
 * Java Program to check whether a number is odd or 
 * even using a function
 */

public class EvenOddNumberCheckFunction {

    public static void main(String[] args) {
        int num;
        Scanner scanner;
        // Take an integer from user
        scanner = new Scanner(System.in);
        System.out.println("Enter an Integer");
        num = scanner.nextInt();

        /*
         * Calling isEven method to check whether num is even or odd.
         */
        if (isEven(num)) {
            // num is even
            System.out.println(num + " is Even Number");
        } else {
            // num is odd
            System.out.println(num + " is Odd Number");
        }
    }

    /**
     * Returns 1 if num is even else return 0.
     */
    public static boolean isEven(int num) {
        if (num % 2 == 0)
            return true;
        else
            return false;
    }
}
Output
Enter an Integer
9
9 is Odd Number
Enter an Integer
8
8 is Even Number