Re: error with "if" !!!

On Apr 28, 3:52 am, nakisa <nakisa.noor...@xxxxxxxxx> wrote:
Hi ,everybody
I have encounter with strange error ( strange in my point view !)
In program, I need to find the sample values of function named f . I
use these 3 commands :
1) if (f<0.0005D0 ) then
2) if (abs(f-0.0005D0)<0.001D0) then
3) if (abs(f-0.0005D0)<0.01D0 ) then

to see the answer . I was surprised to see the answer of this commands
are different !
for example , 7.3124E-5 only given by second if !!
my question is what is the best way to find f near a number and why
the above commands give various answers
thanks
nakisa

The answer is inherent in the nature of floating point representation
-- see the following

http://docs.sun.com/source/806-3568/ncg_goldberg.html

.

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