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Hi there!
> float p;
>
> p = 0.3;
>
> if(p == 0.4)
> do something;
0th law of computer science:
NEVER use == on floats; it simply doesn't work as expected.
In most cases a value cannot be exactly represented as a float
variable; so MOST comparisons for equality WILL fail.
(this is NOT an issue of legOS, it holds true for any language,
compiler, runtime, processor, ...)
(you may compare to 0 (zero); 0 is exactly represented as float)
bis die Tage...
Mathias
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Message has 1 Reply:
 | | Re: Floating ponts ??
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| (...) Exceptions to the 0th law: You are manipulating and comparing floating-point values you know are integers with a magnitude less than a million or two. You are manipulating and comparing values you know are integer multiples of some power of (...) (23 years ago, 17-May-01, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Floating ponts ??
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| Hello everybody I am writing a program that uses floats, but I have some problems. If I write /******/ float p; p = 0.3; if(p == 0.4) do something; /******/ The if statement evaluates to true. Is there anything special I have to do to use floats in (...) (23 years ago, 3-May-01, to lugnet.robotics.rcx.legos)
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