Question

Encode float as int

Asked by: x_terminat_or_3

Hi

I am integrating an existing protocol, that does not have support for floats, but only 16 bit unsigned shorts.

Seeing the values I want to encode are really small (max =30), I thought to use the 8 MSB for the integer part, and the 8 LSB for the fractal part.

The problems arise however as to how do I encode 3.5 differently then 3.05

Any ideas anyone?

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Asked On
2007-11-23 at 09:27:24ID22979206
Tags

float

,

encode

,

integer

Topics

Algorithms

,

Theory

,

Miscellaneous Programming

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: Infinity08Posted on 2007-11-23 at 09:30:28ID: 20339917

What you could do is store 3.5 as 3500 and 3.05 as 3050

That way, you can store the range -30.000 to 30.000 as the integers -30000 to 30000.

 

by: Infinity08Posted on 2007-11-23 at 09:31:56ID: 20339926

It also makes it easy for addition and subtraction ... nothing special to do, just add the ints. Multiplication and division are slightly more complicated, but not much.

And for output, you can simply do mod 1000 to get the part after the comma, and div 1000 to get the part before the comma.

 

by: jaime_olivaresPosted on 2007-11-23 at 09:43:10ID: 20339979

in your original idea, 3.5 should be stored as 3 and 50, while 3.05 is stored as 3 and 5
But infinity's proposal is more commonly used in this case.

 

by: x_terminat_or_3Posted on 2007-11-23 at 09:51:28ID: 31410686

:-)

20120131-EE-VQP-002

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