Question

Write an application in java that reads in a five-digit integer and determines whether it is a palindrome. If the number is not five digits long, display an error message and allow the user to enter a new value. Tips: 1. Determine the number of digits in the value input by the user , i.e. prompt the user to enter the number of digits of the number. Use a while loop to determine whether the user input contains the proper number of digits. In the condition, determine whether digits is equal to 5. If not, input a new value from the user and determine whether the new value contains the proper number of digits. When the number of digits is five, the loop should terminate. 2. Use division and remainder operations to obtain separate digits. 3. For a 5-digit number to be a palindrome, the first and fifth digits must be the same and the second and fourth digits must be the same.

Answer 1

Java code for the above question:

import java.util.*;

class Main {

   public static void main(String[] args){

        Scanner s = new Scanner(System.in);

        int input, len, x;

        System.out.print("Enter a 5-digit integer\n");

        while(true){

            len=0;

            input=s.nextInt();

            x=input;

            while(x > 0){

                x=x/10;

                len++;

            }

            if(len!=5)

                System.out.print("Please enter a 5-digit integer\n");

            else if(len==5){

                int rnum = 0;

                x=input;

                while(x > 0) {

                    rnum=rnum*10+x%10;

                    x=x/10;

                }

                if(input==rnum)

                    System.out.print(input+" is a palindrome");

                else

                    System.out.print(input+" is not a palindrome");

                System.exit(0);

            }

        }

    }

}

Output: