Re: it looks like bug:(

[Micah Cowan]

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Andrew J. Schorr wrote:
> On Thu, Oct 18, 2007 at 09:28:27AM -0700, Micah Cowan wrote:
>> Try changing ‘print w’ to ‘printf("%.24g\n", w)’, or just set OFMT to a
>> value of "%.24g". OFMT is the conversion specification used to convert
>> numbers to strings for output; CONVFMT is used to convert numbers to
>> strings when required by an expression.
> 
> Actually, the IEEE 754 double-precision floating-point format that gawk
> typically uses has about 16 digits of precision, so printing "%.24g" goes well
> beyond the actual precision of the floating-point representation.

Right. I was being generous. :)

> The easiest way to see the problem is simply to print w-100
> instead of printing w:
> 
>    bash-3.1$ gawk 'BEGIN{
>    > w = 0.0
>    > w = w + 0.15
>    > w = w + 99.45
>    > w = w + 0.4
>    > print w-100
>    > }'
>    1.42109e-14

Illuminates the issue quite clearly indeed.

- --
Micah J. Cowan
Programmer, musician, typesetting enthusiast, gamer...
http://micah.cowan.name/

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