Java Program to Check Odd Number

Posted in Java Tutorial

Updated on Oct 30, 2024

By Mari Selvan

👁️ 100 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

In the realm of programming, dealing with numbers is a fundamental task. One common requirement is checking whether a given number is odd or not.

An odd number is an integer that is not exactly divisible by 2 and leaves a remainder of 1 when divided by 2.

In this tutorial, we will explore a Java program designed to check whether a given number is odd. The program involves using the modulo operator to determine if the number is not divisible by 2.

📄 Example

Let's delve into the Java code that accomplishes this task.

OddNumberChecker.java

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import java.util.Scanner;

public class OddNumberChecker {
  // Function to check if a number is odd
  static boolean isOdd(int number) {
    // If the remainder is 1, the number is odd
    return number % 2 != 0;
  }

  // Driver program
  public static void main(String[] args) {
    // Replace this value with the number you want to check
    int number = 15;

    // Call the function to check if the number is odd
    if (isOdd(number)) {
      System.out.println(number + " is an odd number.");
    } else {
      System.out.println(number + " is not an odd number.");
    }
  }
}

💻 Testing the Program

To test the program with different numbers, modify the value of number in the main method.

Output

15 is an odd number.

🧠 How the Program Works

The program defines a class OddNumberChecker containing a static method isOdd that takes an integer number as input and returns true if the number is odd, and false otherwise.
Inside the main method, replace the value of number with the desired number you want to check.
The program calls the isOdd method and prints the result using System.out.println.

📏 Between the Given Range

Let's take a look at the java code that checks and displays odd numbers in the specified range.

OddNumberChecker.java

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public class OddNumberChecker {

  // Function to check odd numbers in the range 1 to 10
  static void checkOddNumbers() {
    System.out.print("Odd Numbers in the range 1 to 10: ");

    for (int i = 1; i <= 10; i++) {
      if (i % 2 != 0) {
        System.out.print(i + " ");
      }
    }

    System.out.println();
  }

  // Driver program
  public static void main(String[] args) {
    // Call the function to check odd numbers
    checkOddNumbers();
  }
}

💻 Testing the Program

Output

Odd Numbers in the range 1 to 10:
1 3 5 7 9

The range for this program is fixed from 1 to 10. To test the program, simply compile and run it.

🧠 How the Program Works

The program defines a class OddNumberChecker containing a static method checkOddNumbers that checks for odd numbers in the range from 1 to 10 and prints the result.
Inside the method, it uses a for loop to iterate through numbers from 1 to 10.
For each iteration, it checks if the current number is odd (not divisible by 2) and prints it if true.
The main function calls the checkOddNumbers method to perform the check.

🧐 Understanding the Concept of Odd Number

Before delving into the code, let's understand the concept of odd numbers. An odd number is an integer that is not exactly divisible by 2. In other words, when an odd number is divided by 2, the remainder is 1.