原文链接:https://www.geeksforgeeks.org/perl-multi-line-strings-here-document/
Multi-line string using Here Document
Here Document is an alternative way for multiple print statements. A Here-Document can also be used for multi-line string. It declares a delimiter at the start to know till where the string needs to take input. A Here-Document starts with ‘<<’ followed by the delimiter of the user’s choice. The string reads the code until the delimiter occurs again and all the text in between is taken as the string.
Example:
```c```c
# Perl code to illustrate the multiline
# string using Here-Document # consider a string scalar
$GeeksforGeeks = 'GFG'; # defining multiline string using
# ending delimiter without any quotes
$deli = <<string_ending_delimiter; Multiline string using Here-Document on $GeeksforGeeksstring_ending_delimiter # displaying result
print "$deli\n\n"; # defining multiline string using
# ending delimiter with double quotes
$deli = <<"string_ending_delimiter"; Multiline string using Here-Document on $GeeksforGeeksstring_ending_delimiter # displaying result
print "$deli\n\n"; # defining multiline string using
# ending delimiter with single quotes
$deli = <<'string_ending_delimiter'; Multiline string using Here-Document on $GeeksforGeeksstring_ending_delimiter # displaying result
print "$deli\n\n";