Re: Question preincrement

Have you read the documentation?

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 behavior. Avoid statements like:
           $i = $i ++;
           print ++ $i + $i ++;
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Does the last line look familiar?

In Section Seekers of Perl Wisdom