title: Float precision bits
body: <p>In this wiki <a href="http://en.wikipedia.org/wiki/Single_precision_floating-point_format" rel="nofollow">article</a> it shows 23 bits for precision, 8 for exponent, and 1 for sign</p>
  
  <p>Where is the hidden 24th bit in float type that makes (23+1) for 7 significand digits?</p>