Program to Find the Reverse of a Number in Java
Reversing a Number
The reverse of a number is obtained by extracting each digit and constructing a new number in reverse order.
We will explore a method to compute the reverse of a number using Java programming.
Method: Using a while Loop
We extract each digit using the modulus operator and build the reversed number.
import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter a number: "); int num = scanner.nextInt(); int reversedNum = 0, digit; // Loop to extract and reverse digits while (num > 0) { digit = num % 10; // Extract last digit reversedNum = reversedNum * 10 + digit; // Construct reversed number num /= 10; // Remove last digit from number } // Print the result System.out.println("Reversed number = " + reversedNum); scanner.close(); } }
Output:
Enter a number: 1234 Reversed number = 4321