How do I simulate the divide function?

public static double Divide(double left, double right)
{
    double count = 0;
    double num = right;
    while (num != 0)
    {
        num -= left;

        if (num < left)
        {
            count += left % num;
        }
        else
        {
            count += 1;
        }
    }

    return count;
}