Select Code to Download

#!/usr/bin/perl

...

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,
is SCALAR(0x55d283691438)
...
and the difference is 3
the sum of 9 and 2 is 11
and the difference is 7