C++ Program to Reverse a Number

import java.io.*;

class Reverse

{

        public static void main(String args[])throws Exception

        {

        int a, b=0, c, i, r, j=1;

        DataInputStream in = new DataInputStream(System.in);

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

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

        for(i=1; i<c; i++)

        {

         j=j*10;

        }

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

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

        while(a!=0)

        {

         r = a%10;

         b =(j*r)+b;

         j=j/10;

         a=a/10;

        }

        System.out.println("The reversed number is\n"+b+"");

        }

}