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  1. or download this
    #!/usr/bin/perl
use strict;
...
exit;

__END__
  2. or download this
    U:\>uninit01.pl
perl version: 5.018002
Use of uninitialized value $x in print at U:\uninit01.pl line 10.
Use of uninitialized value in print at U:\uninit01.pl line 10.
Use of uninitialized value $x in printf at U:\uninit01.pl line 11.
  3. or download this
    #!/usr/bin/perl
use strict;
...
exit;

__END__
  4. or download this
    U:\>uninit02.pl
perl version: 5.018002
...
Use of uninitialized value in print at U:\uninit02.pl line 12.
No error found.
Use of uninitialized value $x in printf at U:\uninit02.pl line 29.