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BROWSEBYCATEGORY +Tool Basics -Language Basics Case Sensitivity Code Blocks Comments Constants◄╣ End of Statement Literals Variables +Language Details +Data Structures +Statements +Operators +Commands +Database +OOP Basics +OOP Details

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PERLLANGUAGE Perl +Tool Basics -Language Basics Case Sensitivity Code Blocks Comments Constants◄╣ End of Statement Literals Variables +Language Details +Data Structures +Statements +Operators

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Perl Language Basics

Constants

A constant is just like a variable (it holds a value) but, unlike a variable, you cannot change the value of a constant.

In Perl, you declare constants using the use constant keywords:

use constant CONST_NAME => "Value";

Constants in Perl are case sensitive. A common standard in Perl is to use all-uppercase letters, with underscores to separate words within the name.

Syntax Example:

use constant FULL_NAME => 'Mike Prestwood';
use constant AGE => 38;

print "Your name is " . FULL_NAME . ".<br>";
print "You are " . AGE . ".<br>";

To/From Code Guide: Constants (Cross Ref > Language Basics) vs. Other Languages

Definition: