From perlop:

Note that just as in C, Perl doesn't define when the variable is incremented or decremented. You just know it will be done sometime before or after the value is returned. This also means that modifying a variable twice in the same statement will lead to undefined behaviour. Avoid statements like:

$i = $i ++; print ++ $i + $i ++;

Perl will not guarantee what the result of the above statements is.

"Undefined behaviour" means "anything could happen".

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In reply to Re: Prefix and postfix increment/decrement operator query by davorg
in thread Prefix and postfix increment/decrement operator query by saurabh.hirani

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