Java: Check if a positive number is a palindrome or not

Last update on May 12 2025 13:12:36 (UTC/GMT +8 hours)

Check Palindrome Number

Write a Java program to check if a positive number is a palindrome or not.

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.*;

public class test {
    public static void main(String[] args) {
        int num;
        
        // Create a Scanner object for user input
        Scanner in = new Scanner(System.in);
        
        // Prompt the user for a positive integer
        System.out.print("Input a positive integer: ");
        
        // Read the integer entered by the user
        int n = in.nextInt();
        
        // Display a message to check if the number is a palindrome
        System.out.printf("Is %d a palindrome number?\n", n);
        
        // Check if the number is a palindrome and print the result
        System.out.println(is_Palindrome(n));
    }

    // Function to reverse the digits of a number
    public static int reverse_nums(int n) {
        int reverse = 0;
        while (n != 0) {
            reverse *= 10;
            reverse += n % 10;
            n /= 10;
        }
        return reverse;
    }

    // Function to check if a number is a palindrome
    public static boolean is_Palindrome(int n) {
        return (n == reverse_nums(n));
    }
}

Sample Output:

Input a positive integer: 151                                          
Is 151 is a palindrome number?                                         
true 

Flowchart:

For more Practice: Solve these Related Problems:

• Modify the program to check if a string is a palindrome.
• Write a program to find the next palindrome number greater than a given number.
• Modify the program to check if a negative number is a palindrome.
• Write a program to count the number of palindromic numbers in a given range.

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