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Line 56:
Line 56: − [http://perldoc.perl.org/functions/print.html print] "Hello, world"; + Line 64:
Line 64: − [http://perldoc.perl.org/functions/print.html print] + Line 76:
Line 76: − [http://perldoc.perl.org/functions/print.html print] "Hello, world"; + − [http://perldoc.perl.org/functions/print.html print] 'Hello, world'; + − [http://perldoc.perl.org/functions/print.html print] "Hello, $name\n"; # works fine + − [http://perldoc.perl.org/functions/print.html print] 'Hello, $name\n'; # prints $name\n literally + − [http://perldoc.perl.org/functions/print.html print] 42; + − [http://perldoc.perl.org/functions/print.html print]("Hello, world\n"); + − [http://perldoc.perl.org/functions/print.html print] "Hello, world\n"; +
→Basic syntax overview
Perl statements end in a semi-colon:
Perl statements end in a semi-colon:
print "Hello, world";
Comments start with a hash symbol and run to the end of the line
Comments start with a hash symbol and run to the end of the line
Whitespace is irrelevant:
Whitespace is irrelevant:
print
"Hello, world"
"Hello, world"
;
;
Double quotes or single quotes may be used around literal strings:
Double quotes or single quotes may be used around literal strings:
print "Hello, world";
print 'Hello, world';
However, only double quotes "interpolate" variables and special characters such as newlines (\n ):
However, only double quotes "interpolate" variables and special characters such as newlines (\n ):
print "Hello, $name\n"; # works fine
print 'Hello, $name\n'; # prints $name\n literally
Numbers don't need quotes around them:
Numbers don't need quotes around them:
print 42;
You can use parentheses for functions' arguments or omit them according to your personal taste. They are only required occasionally to clarify issues of precedence.
You can use parentheses for functions' arguments or omit them according to your personal taste. They are only required occasionally to clarify issues of precedence.
print ("Hello, world\n");
print "Hello, world\n";
More detailed information about Perl syntax can be found in [http://perldoc.perl.org/perlsyn.html perlsyn].
More detailed information about Perl syntax can be found in [http://perldoc.perl.org/perlsyn.html perlsyn].