Question

Please explain the following code in words/java doc public static void main(String args[]){ int input; Scanner scan = new Scanner(System.in); System.out.println("Input Number= "); input = scan.nextInt(); System.out.println("Reverse = "+reverseNum(input)); } public static int reverseNum(int num) { int reverse =0; while(num != 0){ reverse *= 10; reverse += num%10; num /= 10; } return reverse; } }

A. The code takes a number as input and prints its reverse.
B. The code calculates the sum of digits in a number.
C. The code generates a random number and prints its reverse.
D. The code checks if a number is a palindrome.

Answer 1

The code takes a number as input from the user and then prints its reversed version. Option A is the correct answer.

Step-by-step explanation:

Here's a breakdown of the code's functionality:

1. Input:

The main method prompts the user to enter a number using a Scanner object.

The entered number is stored in the input variable.

2. Reverse Function:

The reverseNum method is called, passing the input number as an argument.

It initializes a reverse variable to 0.

It employs a while loop to iterate until the input number becomes 0:

Inside the loop:

The reverse variable is multiplied by 10 to create space for the next digit.

The last digit of the input number is extracted using the modulo operator (%) and added to reverse.

The input number is divided by 10 to remove the last digit.

The reverse function returns the reversed number.

3. Output:

The main method prints the reversed number obtained from the reverseNum function.

Option A is the correct answer.