Given Number is Binary or Not

package practice;

import java.util.Scanner;

public class rough
{
	public static void main(String args[]) 
	{
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		int temp=a;
		while(temp!=0) 
		{
			int r = temp%10;
			
			if(r == 1 || r == 0) 
			{
				temp/=10;
			}
			else {
				System.out.println("This Number is not binary");
			break;
			}
		}
		if(temp==0)
			System.out.println("This Number a binary");
	}
}