C:\Users\user\Desktop\perl>perl test4.pl
Argument "" isn't numeric in addition (+) at test4.pl line 24, <$fh> line 11.
Use of uninitialized value in hash element at test4.pl line 25, <$fh> line 11.
Use of uninitialized value in hash element at test4.pl line 25, <$fh> line 11.
Use of uninitialized value in hash element at test4.pl line 25, <$fh> line 11.
Use of uninitialized value in hash element at test4.pl line 25, <$fh> line 11.
Argument "" isn't numeric in addition (+) at test4.pl line 24, <$fh> line 11.