Java program to check the number is palindrome or not.

                Let us see the java program to check the number is palindrome or not. so first we should know about palindrome. and logic to write a program, get to know about them below.

Content.

1. What is palindrome the number.
2. Logic for program.
3. Program.
4. Explanation.
5. Output.

What is palindrome the number?

             Palindrome number means if we give a number like 858, when the number is reversed we should get same number, 858.

Example:

                    our Input: 2002

                       Output: 2002

Logic for the Program.

• We need to display the last number first so, we divide(%) the number by 10 and take the reminder as answer.
• So, when we use that in a loop we get the Reversed number.
• And check whether the reversed number is equal to the given number, if it is equal, then number is palindrome. If not, it is not a palindrome.

Program

import java.io.*;

class pal

{

 public static void main(String agr[]) throws IOException

  {

    int m,n,r,s=0;

    InputStreamReader read = new InputStreamReader(System.in);

    BufferedReader in = new BufferedReader(read);

    System.out.println("Enter the number");

    n=Integer.parseInt(in.readLine());

    m=n;

     while(n!=0)

         {

            r=n%10;

            s=s*10+r;

            n=n/10;

         }

      if(s==m)

    System.out.println("The given number is palindrome, "+s);

      else

    System.out.println("The given number is not palindrome," +s);

  }

}

Explanation.

• We have given the class name has pal.
• public static void main(String arg[]) refers to add a method i.e array of strong method to the program.
• int n,m,r,s is declaring the variable, s is declared to store 0. 
• InputStreamReader read = new InputStreamReader(System.in); we create this object because we need to give the value to variable at the time of execution, this is a one of the way to give value to a variable.
• BufferedReader in = new BufferedReader(read); we create this object because, we need a buffer to store the value of the variable.
• n=Integer.parseInt(in.readLine()) is used to convert array of numbers to primitive integer.
• To check whether the reversed number is equal to the given number we use m=n.
• Now, we have to give condition which satisfies all the above int the logic for the program. I choose, While loop with n!=0 (n not-equal to 0)condition.
• n is the number we give.
• inside the loop ,
• to get reverse number, r=n%10
• to end the loop after reverse the number, s=(10*s)+r;
• to keep continue the loop for next number, n=n/10;
• And we should also use if statement to display the result.
• System.out.println is used to display the given in output screen(make sure S in System is capital)

Know more about if statement.

Know more about while loop here.

Output:

       Compile : javac pal.java

       Run        : java pal

       Enter the number

       2552

      The given number is palindrome, 2552.

      Compile : javac pal.java

       Run        : java pal

       Enter the number

        8552

      The given number is not palindrome, 2558.

known how to execute java program here.