C# get digits from float variable

Question

I have a float variable and would like to get only the part after the comma, so if I have 3.14. I would like to get 14 as an integer. How can I do that?

Answer 1

using Regular Expressions (REGEX)

string input_decimal_number = "3.14";
var regex = new System.Text.RegularExpressions.Regex("(?<=[\\.])[0-9]+");
if (regex.IsMatch(input_decimal_number))
{
    string decimal_places = regex.Match(input_decimal_number).Value;
}

// input : "3.14"
// output : "14"

// input : "2.50"
// output : "50"

you can find more about Regex on http://www.regexr.com/

Math Solution using Math.Truncate

 var float_number = 12.345;
 var result = float_number - Math.Truncate(float_number);

Using multiplier [which is 10 to the power of N (e.g. 10² or 10³) where N is the number of decimal places]

   // multiplier is " 10 to the power of 'N'" where 'N' is the number 
   // of decimal places
   int multiplier = 1000;  
   double double_value = 12.345;
   int double_result = (int)((double_value - (int)double_value) * multiplier);

// output 345