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As someone else already mentioned, you really should take a look at just exactly what the pre- and post-increment operators are doing and when.

Also, and even more importantly, you have made a major error in thinking that your code snippet from your comment above ($x = ++$x + $x++ + $x) is the same as in your OP, which was $x = $x + ++$x + $x++. They are entirely different.

Here is a simple program to demonstrate the point:

#!/usr/bin/perl use strict; use warnings; my $x = 5; $x = $x + ++$x + $x++; print "x: $x\n"; my $y = 5; # avoid any contamination from first group. $y = ++$y + $y++ + $y; print "y: $y\n"; exit; __END__ Output: [~/perl/test]# ./prepost.pl x: 18 y: 20
On time, cheap, compliant with final specs. Pick two.

In reply to Re: question 1st - undefined behaviour by boftx
in thread question 1st - undefined behaviour by rumos2

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