[ic] Really strange [calc] evaluation

Grant emailgrant at gmail.com
Wed Jan 27 02:44:18 UTC 2010

>> The following should evaluate to zero:
>> [calc]197.7 - (32.95 * 6)[/calc]
>> but instead I get:
>> -2.8421709430404e-14
>> Everything else is functioning normally.  Does anyone know what's
>> going on here?  I'm on 5.6.1.
> Standard floating point arithmetic. Same thing occurs in every programming
> language that uses FP. Use rounding (printf) or CPAN modules to handle it.

OK, I'd like to change the code so that it produces the correct
result.  I tried:

[calc]sprintf("%.0f",(197.7 - (32.95 * 6)))[/calc]

but I get -0.  This situation seems pretty strange to me.  How can I
get [calc] to calculate reliably?

- Grant

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