title: How do I determine the number of places following a decimal in a floating point value?
body: <p>In C++ you can use std::numeric_limits&lt;FloatingPointType&gt;::digits10 to find out exactly how many places of precision you can get before the decimal place. How do I find out how many decimal places I can get following it, if I know the number will always be fixed-point between 0 and 1 inclusive?  </p>
  
  <p>Edit: The reason I ask is that I have an external RNG generating doubles and piping them through to a second program using standard input and output, so if the randomly generated numbers aren't output correctly to standard output, the second program can't grab their full values through standard input because they get truncated by the output of the first program, then rounded to representable values by the second program. I'd like to pipe the values between programs fully intact.
  Thanks</p>