Transcription of Perl Data Types and Variables
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Perl Data Types and Variables
Copyright 2006 Stewart WeissCopyright 2009 Stewart WeissPerl data Types and VariablesPerl data Types and VariablesData, Variables , expressions, and much more2 CSci 132 Practical UNIX with PerlData Types in PerlPerl is unlike most high-level languages in that it does not make a formal distinction between numeric data and character data , nor between whole numbers and numbers with fractional parts. Most modern languages invented before perl ask you to declare in advance whether a variable will store a character, a whole number, a floating point number, or something else. Not 132 Practical UNIX with PerlTypelessness in PerlTo illustrate, if we declare a variable named $anything using the statement my $anything; then all of the following assignment statements are valid: $anything = "Now I am a string"; $anything = 10; $anything = ;In short, in perl , Variables are untyped. 4 CSci 132 Practical UNIX with PerlThree data classesHowever, perl does distinguish the class of data , , whether it is primitive or structured.
4 CSci 132 Practical UNIX with Perl Three data classes However, Perl does distinguish the class of data, i.e., whether it is primitive or structured. Scalars are primitive and lists and hashes are structured: scalar data a single data item list data a sequence or ordered list of scalars hash data an unordered collection of (key,value) pairs Scalars may be numbers such as 12 or 44.3 or strings like
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