Finding the number of places after the decimal point of a Double

Question

I have a Double value:

double a = 4.5565;

What is the easiest way to calculate the number of digits after the decimal point (4 in this case

Answer 1

Write a function

int CountDigitsAfterDecimal(double value)
        {
            bool start = false;
            int count = 0;
            foreach (var s in value.ToString())
            {
                if (s == '.')
                {
                    start = true;
                }
                else if (start)
                {
                    count++;
                }
            }

            return count;
        }