Finding a number that is both a prime number and a palindrome

Answer 1

Your palindrome method is returning wrong result. You are modifying n and after then comparing with reversed number.

First save that value then compare after while loop

pal()

Answer 2

You are mistaking in your temp function. Your n variable is getting 0 and you are comparing it to reverse no.

Assign that variable to a temp variable and then compare. I made some changes to your code and it working great.

import java.util.*;
public class A 
{
    public static void main (String[] args)  {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter a value:");  //Asking the user to input     the value n
        int n =scanner.nextInt();
        for(int i=2;i<=n;i++){
            if (prime(i) && pal(i)) { //if a number is both a prime AND a palindrome (both methods are being compared here)
                System.out.println(i);                          //it is printed out
            }
        }
    }
    public static boolean prime(int n) { //the method for finding the prime number
        int x = 2;
        while (n%x>0) {
            x+=1;
        } if (x==n) {
            return true;
        } else {
            return false;
        }
    }
    public static boolean pal(int n) { //the method for finding a palindrome
        int rev = 0;
            int rmd = 0;
        int temp = n;
            while (n>0) {
                rmd = n%10;
                rev = rev*10 + rmd;
                n = n/10;
            }
        if (rev==temp){
                return true;
            }else{
                return false;
            }
    }
}

Output :