Decimal to Binary

Write a program to convert decimal to binary.

import java.util.Scanner;

class Decimal2Binary

{

    public static void main()

    {

        int last;

        long binary=0;

        System.out.println("Enter a number in base 10");

        Scanner in = new Scanner(System.in);

        int a = in.nextInt();

        for(int i=0;a>0;i++)

        {

            last= a%2; a=a/2;

            binary=(long)Math.pow(10,i)*last + binary;

        }

        System.out.println("Given number in base 2   "+binary);

    }

}

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