Write a Java Program Check given number is palindrome or not ? | StudyEcart | CODE006

Definition:  A palindrome number is a number that reads the same forward and backward. To determine whether a given number is a palindrome or not, you can follow these steps:

1. Accept the input number from the user.

2. Convert the number to a string.

3. Compare the characters from the beginning and the end of the string, moving inwards until they meet.

4. If all characters match, the number is a palindrome. Otherwise, it's not.

Here's the Java program to achieve this:

 
import java.util.Scanner;

public class PalindromeNumber {
    public static void main(String[] args) {
        // Step 1: Accept input from the user
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int number = scanner.nextInt();
        scanner.close();
        
        // Step 2: Convert the number to a string
        String numStr = Integer.toString(number);
        
        // Step 3: Compare characters
        boolean isPalindrome = true;
        int left = 0;
        int right = numStr.length() - 1;
        
        while (left < right) {
            if (numStr.charAt(left) != numStr.charAt(right)) {
                isPalindrome = false;
                break;
            }
            left++;
            right--;
        }
        
        // Step 4: Display the result
        if (isPalindrome) {
            System.out.println(number + " is a palindrome.");
        } else {
            System.out.println(number + " is not a palindrome.");
        }
    }
}

(code-box)

Explanation:

1. We use the `Scanner` class to accept input from the user.

2. The input number is converted to a string using `Integer.toString()`.

3. We use two pointers (`left` and `right`) to compare characters from the beginning and the end of the string.

4. If at any point the characters at the corresponding positions don't match, we set the `isPalindrome` flag to `false` and break out of the loop.

5. After the loop, we check the value of the `isPalindrome` flag to determine whether the number is a palindrome or not and display the appropriate message.

Now you have a Java program that can determine whether a given number is a palindrome or not. Just compile and run the program, and provide the input number to see the result.

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