fixed point vs fixed decimal

Terry Hancock hancock at
Wed Jan 8 02:41:35 CET 2003

John Roth wrote:
> You're right! I'd forgotten about the applications in graphics and
> motor control where floats are too expensive.

They are also a convenient natural representation for angles -- if you 
allow a fixed size, unsigned integer to overflow without error, and map the 
range of the integer to a full circle, then its behavior is exactly correct 
for the task and does not require special edge-case handling.

I saw this trick in a graphics programming book years ago.

They can also be handy in graphics acceleration tasks (but in C, obviously).

Anansi Spaceworks

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