Just as a teaser, running choroba's sum under Perl 5: 
  DB<1> $x = 319.02 - 112.09 - 69.75 - 113.57 - 23.61;

  DB<2> p $x
-1.4210854715202e-14

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In both Python and Ruby, the result is -1.4210854715202004e-14, which might seem more accurate (3 more digits), but happens to be in fact a very little bit further from truth.

The same in Perl 6: 

> my $x = 319.02 - 112.09 - 69.75 - 113.57 - 23.61;
0
> say sprintf "%.50f", $x
0.00000000000000000000000000000000000000000000000000
> say $x == 0;
True

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Not only does Perl 6 give the correct result, even when printing 50 decimal digits, but even comparing the result with 0 gives the correct answer.

In reply to Re: Getting stranger values in subtraction by Laurent_R
in thread Getting stranger values in subtraction by Anonymous Monk

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