Reverse a Number

REVERSE A NUMBER 

Reverse a Number: A Simple Mathematical Trick

Reversing a number is one of the simplest yet most interesting mathematical operations. The process involves rearranging the digits of a number in reverse order to produce a new number. For example:

• Input: 12345
• Output: 54321

 import java.util.*;

class HelloWorld {

    public static void main(String[] args) {

        int n=sc.nextInt();

        int res=0;

        int rem;

        while(n!=0)

        {

            rem=n%10;

            res=res*10+rem;

            n/=10;

        }

        System.out.print(res);

    }

}

How Does it Work?

The reversal process extracts each digit from the number, starting from the last, and reconstructs the number in reverse order. Here's the step-by-step logic:

1. Start with the last digit using the modulo operator (%).
2. Add this digit to the result after shifting it by multiplying the result by 10.
3. Repeat the process by removing the last digit using integer division (/).

Applications of Reversing Numbers

• Palindrome number checks.
• Cryptography and encoding algorithms.
• Fun programming challenges.