2009/11/3 Majian <jian...@gmail.com>: > > my $i = 1; > print ++$i + ++$i, "\n"; > > The above code prints out the answer 6 . > But in the other language the anser is 5 , >
>From the documentation (http://perldoc.perl.org/perlop.html#Auto-increment-and-Auto-decrement): "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." -- Erez "The government forgets that George Orwell's 1984 was a warning, and not a blueprint" http://www.nonviolent-conflict.org/ -- http://www.whyweprotest.org/ -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
