title: Floating point hex notation in Swift
body: <p>I don't understand how floating point numbers are represented in hex notation in Swift.  Apple's documentation shows that 0xC.3p0 is equal to 12.1875 in decimal.  Can someone walk me through how to do that conversion?  I understand that before the decimal hex value 0xC = 12. The 3p0 after the decimal is where I am stumped.</p>