My Math::BigApprox is smarter than regular floating point numbers. It knows that $x == $y iff $x eq $y so you won't have that problem when using it: 

use Math::BigApprox 'c';
my $x= c(1);
while(  $x < 2  ) {
    print "$x\n";
    $x += 0.1;
}
print "Stop: x=$x\n";
print "Not 2\n" if $x != 2;

[download]

and such numbers have about the same precision as floating point when using such small numbers, they don't have a big performance impact (mostly just the cost of overload.pm), and you can compute 500,000! (factorial, about 1.0228e+2632341) without overflowing nor taking all day.

...which gives me another idea for a very simple module. Math::Eq ?

- tye        

In reply to Re: When is a 2 not a 2? (eq) by tye
in thread When is a 2 not a 2? by RockM66

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