Help for this page
say "the sum of 9 and $b is ", &sum_and_diff(9, $b, \$diff);
say "and the difference is ", $diff; # this is line 34
The address of $varible, which contains the value 22,
the sum of 9 and 2 is 11
Use of uninitialized value $diff in say at line 34.
and the difference is
Results (69 votes). Check out past polls.