Introduction to single-line and multi-line annotations in perl

Program comments in Perl: single-line comments and multi-line comments

(1) single line comment:

All rows starting with # are considered as comments by perl. But with one exception, the first line of the perl program starts with #. It specifies the interpreter of the perl program.

Example: # print 1;

The disadvantage of this method is that only one line can be annotated at a time. If the code to be annotated is long, it is very troublesome.

(2) multi-line comment:

The most common method is to use POD (Plain Old Documentations) for multi-line comments. The method is as follows:

= Pod
Codes to comment
= Cut
Note: = pod = cut can only start with = at the beginning of a row and end with = cut. Note: = it must be followed by one character. = Cut can be used later.