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Hexadecimal floating-point literals

 
Jesper de Jong
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I've been programming in Java for more than 10 years, so I thought I knew the language inside out, but I just discovered a new, obscure feature: you can write floating-point constants in hexadecimal.

You can for example write: 0x50.1p3 which is equal to 640.5.
 
Campbell Ritchie
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I never knew that, but it's in the Java™ Language Specification that you can use p/P as an exponent indicator.
 
David Newton
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Yeah, I never actually understood this one... I suppose some day it could come in handy?
 
It is sorta covered in the JavaRanch Style Guide.
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