> 1) Isn't that equivalent to:

No, your version fails the limits when they are swapped

Here a generalized test suite for everyones experiments:

use v5.12;
use warnings;

our ($a,$b,$x);

for my $lim ( [2,4], [4,2] ) {
    ($a,$b) = @$lim;
    for $x (1..5) {
        my @r = (&s0,&s1);
        unless ( $r[0] == $r[1] ) {
            say "fails for $x in [@$lim] with <$r[0]>,<$r[1]>";
        }
    }
}

sub s0 {
    ($x > $a == $x < $b) || $x == $a || $x == $b;
}

sub s1 {
    $x >= $a == $x <= $b;
}

[download]

c:/tmp/pm/clever_intervall.pl 
fails for 2 in [4 2] with <1>,<>
fails for 4 in [4 2] with <1>,<>

[download]

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re^3: Range check with unordered limits by LanX
in thread Range check with unordered limits by hexcoder

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