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$ perl 947860.pl
Global symbol "$letter" requires explicit package name at 947860.pl li
+ne 5.
...

BEGIN not safe after errors--compilation aborted at /usr/lib/perl5/5.1
+0/Carp/Heavy.pm line 11.
Compilation failed in require at /usr/lib/perl5/5.10/Carp.pm line 33.

use strict;
use warnings;
...
sub addtwo {
$letter +=2;
}

Argument "b" isn't numeric in addition (+) at 947860a.pl line 10 (#1)
    (W numeric) The indicated string was fed as an argument to an oper
+ator
...
    will identify which operator was so unfortunate.

4

use strict;
use warnings;
...
    $letter++;
    $letter++;
}

f