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# Even Odd Program in Java

Updated on 19/07/20249,083 Views

## Introduction

Before programmers can start writing complex polynomial functions and go on to develop applications, embedded systems, and big data processing in Java, they must master the basics of programming. Learning the even odd program in Java is amongst the most fundamental skills students study when coding with Java. This extensive tutorial on odd even program in Java will help beginners apply these basic functions to various algorithms and mathematical equations later on.

## Overview

Among the different classifications of natural numbers, even and odd is one fundamental classification. Any natural number completely divisible by 2, i.e., generating a remainder 0, is even. Some examples are ⎯ 64, 42, and 88.

The remaining numbers are odd since they leave a remainder of 1 when divided by 2. Some examples of odd numbers are ⎯ 13, 91, and 67.

There are various methods to check if a number is odd or even in Java. Some methods to check even and odd numbers include Brute Force Naive Approach, Bitwise operators like OR, AND, XOR, LSB (Least Significant Bit), and ternary operators.

## Methods to Check Even Odd Program in Java

### Brute Force Naive Approach

`public class Main {      public static void main(String[] args) {           int n= 51;     //checking whether the number is even or odd     if (n% 2 == 0)              System.out.println(n + " is Even");     else              System.out.println(n + " is odd");      } }`

This Java program uses “public static void main(String[] args)” main method to determine whether the user input variable ‘n’ is odd or even. We have assigned ‘n’ the value 51. If “(n% 2 == 0)” the remainder is equal to zero, the number is even. Finally, “System.out.println()” is used to print the result to the console. The "51 is odd" message is the printed result in this case.

## Even Odd Program in Java Using Bitwise Operators

• ### Using Bitwise OR

`//Java Program to Check if Given Integer is Odd or Even// Using Bitwise OR// Importing required classesimport java.util.*;import java.util.Scanner;// Main classpublic class even_odd {    // Main driver method    public static void main(String[] args)    {        // Declaring and initializing integer variable        // to be checked        //int n = 101;        Scanner sc=new Scanner(System.in);       System.out.println("Enter a number");        int n= sc.nextInt();        System.out.println("number is: " + n);        // Condition check        // if n|1 if greater than n then this number is even       if ((n | 1) > n) {            // Print statement            System.out.println("Number is Even");        }        else {            // Print statement            System.out.println("Number is Odd");        }    }}`

Here, the main class “even_odd” is declared with the public access modifier and prompts the user to enter a number using “System.out.println("Enter a number");”. The input number is stored in an integer variable “n” using “int n= sc.nextInt();”. The program checks if it is even or odd using the bitwise OR operator “|.” If the condition is true, the program prints "Number is Even" and ends after printing the result.

• ### Using Bitwise AND

`//Java Program to Check if Given Integer is Odd or Even// Using Bitwise AND// Importing required classes import java.util.*;import java.util.Scanner;// Main classpublic class even_odd {    // Main driver method    public static void main(String[] args)    {        // Declaring and initializing integer variable        // to be checked        //int n = 101;        Scanner sc=new Scanner(System.in);       System.out.println("Enter a number");        int n= sc.nextInt();        System.out.println("number is: " + n);        // Condition check        // if n|1 if greater than n then this number is even       if ((n & 1) == 1) {            // Print statement            System.out.println("Number is Odd");        }        else {            // Print statement            System.out.println("Number is Even");        }    }}`

This even odd program in Java using Scanner class uses the bitwise “AND” operator to check if the least significant bit is set to 1 or 0. Variable “n” stores the user input number, which in this case is 7. If the least significant bit returns 1, it is odd; if it returns 0, it is even. After displaying the “Number is Odd” or “Number is Even” message, the program terminates.

• ### Using Bitwise XOR

`//Java Program to Check if Given Integer is Odd or Even// Using Bitwise X-OR// Importing required classesimport java.util.*;import java.util.Scanner;// Main classpublic class even_odd {    // Main driver method    public static void main(String[] args)    {        // Declaring and initializing integer variable        // to be checked        //int n = 101;        Scanner sc=new Scanner(System.in);       System.out.println("Enter a number");        int n= sc.nextInt();        System.out.println("number is: " + n);        // Condition check        // if n|1 if greater than n then this number is even        if ((n ^ 1) == n + 1) {            // Print statement            System.out.println("Number is Even");        }        else {            // Print statement            System.out.println("Number is Odd");        }    }}`

The program imports the necessary classes and creates a “Scanner” object "sc" to prompt the user to enter a number. The program uses the XOR operator to determine if the number is even or odd. If the operation result is equal to ‘n+1’, the number entered is even, if it isn’t, the number is odd.

Here the number 9 is entered for which the result of the operation is not equal to ‘n+1’. Hence, the number is odd.

## Even Odd Program in Java by Checking the Least Significant Bit

Another way to check whether a number is odd or even is by checking the LSB of the number. A binary number’s last digit is its LSB. The LSB of an odd number is always 1, and that of an even number is always 0.

### Even Odd Program in Java Using a Ternary Operator

A ternary operator replaces the conventional even odd program in Java using the if-else method to implement the naive logic.

`import java.util.Scanner;public class even_odd {   public static void main(String[] args)    {      Scanner obj = new Scanner(System.in);      System.out.println("Please enter a number : ");      int n = obj.nextInt();      // java odd or even      String strOutput = (n % 2 == 0) ? "even" : "odd";         System.out.println(n + " is " + strOutput);      obj.close();   }}`

In this case, a string variable named "strOutput" is declared and initialized to odd or even based on whether "n" (integer variable) is divisible by 2. The value of "strOutput" is set using a ternary operator. If the remainder acquired upon dividing ‘n’ by 2 is 0, it is even for which "strOutput" is set to even; if not, it is odd and "strOutput" is set to odd. The result is printed on the console using the “println()” method.

### Check Whether a Number is Even or Odd Using Bitwise Operator

In this instance, we have shown the use of all Bitwise operators, i.e., OR, AND, and XOR, to check whether the input integer variable is even or odd.

`//Java Program to Check if Given Integer is Odd or Even// Using Bitwise OR,AND,XOR// Importing required classesimport java.util.*;import java.util.Scanner;// Main classpublic class even_odd {    // Main driver method    public static void main(String[] args)    {        // Declaring and initializing integer variable        // to be checked        //int n = 101;        Scanner sc=new Scanner(System.in);        System.out.println("Enter a number");        int n= sc.nextInt();        System.out.println("number is: " + n);        // Condition check        // if n|1 if greater than n then this number is even        if ((n | 1) > n) {            // Print statement            System.out.println("Number is Even");        }        else {            // Print statement            System.out.println("Number is Odd");        }        System.out.println("Enter a number");        int x=sc.nextInt();        System.out.println("number is: " + x);        // Condition check        // if x|1 if greater than x then this number is even        if ((x & 1) != 0) {            // Print statement            System.out.println("Number is Odd");        }        else {            // Print statement            System.out.println("Number is Even");        }        System.out.println("Enter a number");        int y=sc.nextInt();        System.out.println("number is: " + y);        // Condition check        // if y|1 if greater than y then this number is even        if ((y ^ 1) == y + 1) {            // Print statement            System.out.println("Number is Even");        }        else {            // Print statement            System.out.println("Number is Odd");        }    }}`

The "even_odd" class imports required classes and defines a public static method, "main", which takes an array of Strings as input argument. Inside the "main" method, an object of the Scanner class is created to take user input. The Scanner object reads an integer input from the user and stores it in the integer variable 'n'.

We first used the Bitwise operator OR to check whether the input number is odd or even. If '(n | 1)' is greater than ‘n,’ then ‘n’ is even. If ‘n’ is odd, the message "Number is Odd" is printed on the console. Here we have used 11 as the input number.

Next, we used the Bitwise AND to check if the integer input stored in the variable ‘x’ is even or odd. If (x&1) equals 0, it is even; if not, it is odd. The number used in this instance is 7, for which the result "Number is Odd" is printed to the console.

Last, the XOR operator checks the integer variable ‘y’ for even or odd. If (y ^ 1) equals (y + 1), then ‘y’ is even. Otherwise, ‘y’ is odd.

## Conclusion

For programmers learning the even odd program in Java, using various approaches is essential for a sound base in coding. It is quite simple and easy to understand. If you are new to programming, learning the Even Odd program is equivalent to learning the basics of coding with Java. Master the basics of Java to build a strong career down the line. Consider enrolling in a professional course to understand the language better.

## FAQs

1. How can you create an even odd program in Java using for loop?

We can create two “for” loops to display odd and even numbers. Using the modulus operator in the first loop, check if the remainder is 0. If it is, then the input numbers are even. Next, using the same modulus operator for the second “for” loop, check if the remainder is 1 to verify it is odd.

2. What is the Java program to print odd and even numbers between 1 and 100?

To print odd and even numbers in Java, you can use the even odd program in Java using while loop, the nested if statement method, and for loop.

3. How can you write an even odd program in Java using array?

To print even odd numbers from an array, you have to deduce the remainder of each array element and see if it is divisible by 2. If it is divisible, it is even; if not, it is odd.

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