Binary to Decimal

//Binary to Decimal
public class Bin2Dec
{
    public static void main(long n)
    {
        long temp=n;
        long sum=0,rem,p=0;
        while(n>0)
        {
            rem=n%10;
            sum=sum + (long)(rem*(Math.pow(2,p)));
            n=n/10;
            p++;
        }
        System.out.println("Decimal of "+temp+" = "+sum);
    }
}