JAVA **6.3 Using multiple methods ( 10 points ): Palindromes are numbers or word

Question

JAVA **6.3 Using multiple methods (10 points): Palindromes are numbers or words that are same when read from either end. Eg. Avid diva, civic, 12321, 52925. Write a java program PalindromeByMethods.java that reads in an integer number (any number of digits up to 10 digits) from user input. The program then passes this number on to a method called reportIfPalindrome( ) that returns a boolean value. The method reportIfPalindrome( ) makes a call to another method called reverseNum(int number) that returns the reverse of the original integer back to the reportIfPalindrome( ) method. Based on the original integer and its reversed value received from the reverseNum( ) method, the reportIfPalindrome( ) method decides if the number is a palindrome and passes this information back (a Boolean value) to the main( ) method. Based on the returned value, the main( ) method prints if or not the number is a palindrome. [If you wrote a numOfDigits( ) method for the last program, it will be useful for this program too.]

.

Sample Run 1

This program checks if a user-entered number is a palindrome. Please enter the number: 1234
Printed from main( ):
The number entered is: 1234

Making a call to reportIfPalindrome ( ) Now in method reportIfPalindrome ( )
The number received from main( ) is: 1234 Passing the number to reverseNum( ) Result received from reverseNum( )

The reverse of the received number 1234 is 4321. Reporting my decision back to main( )
Back in main( )
The number 1234 is NOT a Palindrome.

Explanation / Answer

// coding

import java.util.Scanner;
public class Palindrome
{
    boolean reportIfPalindrome(int n)
    {
        int rec=reverseNum(n);
        if(n==rec)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    int reverseNum( int y)
    {
        int sum=0;
    while(y>0)
    {
        int r=y%10;
        sum=sum*10+r;
        y=y/10;
    }
    return sum;
}
public static void main(String args[])
{
    Palindrome ob=new Palindrome();
    Scanner s =new Scanner(System.in);
    System.out.print("Please enter a number :");
    int number=s.nextInt();
    System.out.println("The number entered is:" + number);
    boolean ans=ob.reportIfPalindrome(number);
    if(ans==true)
    {
        System.out.println("The number"+number+"is a Palindrome ");
    }
    else
    {
        System.out.println("The number"+number+"is NOT a Palindrome ");
    }
}
}

//output 1:

Please enter a number :1331
The number entered is:1331
The number1331is a Palindrome

output 2:

Please enter a number :12345
The number entered is:12345
The number12345is NOT a Palindrome

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