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

var precision = 0;
var x = 1.345678901m;

while (x*(decimal)Math.Pow(10,precision) != 
         Math.Round(x*(decimal)Math.Pow(10,precision))) 
   precision++;

precision will be equal to the number of significant digits of the decimal value (setting x to 1.23456000 will result in a precision of 5 even though 8 digits were originally specified in the literal). This executes in time proportional to the number of decimal places. It counts the number of fractional digits ONLY; you can count the number of places to the left of the decimal point by taking the integer part of Math.Log10(x). It works best with decimals as they have better value precision so there is less rounding error.

Answer 2

I think this might be a solution:

 private static int getDecimalCount(double val)
 {
     int i=0;
     while (Math.Round(val, i) != val)
         i++;
     return i;
 }

double val9 = 4.5565d; int count9 = getDecimalCount(val9);//result: 4

Sorry for the duplication -> https://stackoverflow.com/a/35238462/1266873