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  1. or download this
    use strict;
use warnings;
...

print 123 + undef, "\n";  # We want to hide this warning.
print 123 + 'abc', "\n";  # We want to see  this warning.
  2. or download this
    Argument "abc" isn't numeric in addition (+) at 591379.pl line 12.
Use of uninitialized value in addition (+) at 591379.pl line 11.
123
123
  3. or download this
    Argument "abc" isn't numeric in addition (+) at 591379.pl line 12.
123
123