Beginning Web Development With Perl : From Novice to ... - Nabo

314APPENDIX ■ PERL BASICSmy $name = "fred";print 'My name is $name\ n';Here we get$ perl varint2.plMy name is $name\ n$Notice that the system prompt is printed at the end of that line because \ n is not a newlinecharacter within the single quotes. This doesn’t just happen in things we print, it happens everytime we construct a string:#!/usr/bin/perl -w# varint3.pluse strict;my $name = "fred";my $salutation = "Dear $name,";print $salutation, "\ n";This gives us$ perl varint3.plDear fred,$This has exactly the same effect asmy $salutation = "Dear " . $name . ",";but is more concise and easier to understand.If you need to place text immediately after the variable, you can use curly braces todelimit the name of the variable. Take this example:#!/usr/bin/perl -w# varint4.pluse strict;my $times = 8;print "This is the $timesth time.\ n";This is syntactically incorrect, because Perl looks for a variable $timesth, which hasn’tbeen declared. In this case, we have to change the last line by wrapping the variable name incurly braces to this:print "This is the ${ times} th time.\ n";