title: iPhone SDK : NSString NSNumber IEEE-754
body: <p>Can someone help me ? I have a <code>NSString</code> with <code>@"12.34"</code> and I want to convert it into a NSString with the same float number but in single precision 32bits binary floating-point format IEEE-754 : like <code>@"\x41\x45\x70\xa4"</code> (with hexa characters) or <code>@"AEp¤"</code>...
  I'm sure it's something easy but after many hours of reading the doc without finding a solution...</p>
  
  <p>Thank you !</p>