Introduction to the use of single-line and multiline annotations in Perl _ Application Tips

program annotations in Perl: Single-line and multiline comments

(i) Single-line Comment:

Lines beginning with # are considered by Perl as annotations. But with one exception, the first line of the Perl program begins with a #, and he specifies the interpreter for the Perl program.

For example: #print 1;

The disadvantage of this approach is that every time you can only annotate a line, if the code you want to annotate is very long, it is a very troublesome thing.



(ii) Multi-line notes:

The most common approach is to use POD (Plain old documentations) for multiline annotations. The method is as follows:

=pod
Codes to comment
=cut
Note: =pod =cut can only begin at the beginning of the line with = and end with =cut. Note: = one character behind. =cut can not be used behind.