Posted: 1/9/2015 12:33 PM
Post subject: How does Fixed point 20.12 work?
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jlun2
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So, while this has been happening for a while now, I decided to ask after failing to find an answer. From this table I made, values start at a ratio of 0.000244, before somehow diverging further; some of the values even end in odd numbers despite the fact 244 is even. Can anyone please explain how exactly does this system work?
LLCoolDave wrote:
This seems to be competing for the "Worst looking TAS of 2011" Award.
Posted: 1/9/2015 1:10 PM
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Noxxa
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Fixed point 20.12 means using 20 bits for the integer part of the number, and 12 bits for the fractional part. With 12 bits, there are 2^12 = 4096 possibilities for the fractional part, so the smallest possible difference in fractions is 1/4096 = exactly 0.000244140625. Basically, it 'diverges' because 0.000244 is a rounded approximation, not the exact number.
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Posted: 1/10/2015 2:44 AM
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jlun2
Skilled player (1743)
Joined: 9/17/2009
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GBA TASer of 2010
Well. That explains it. Thanks! :)
LLCoolDave wrote:
This seems to be competing for the "Worst looking TAS of 2011" Award.