Perl: the complete reference by Martin C. Brown

By Martin C. Brown

Perl is the internet masters' language of selection for its flexibility, comfort, and cross-platform potential. the main accomplished Perl publication out there - 1,100 a long time of strong content material excellent for programmers of all ability degrees. Covers every thing from the fundamentals to complex programming to extending perl to cross-platform use. CD-ROM comprises code from the ebook, pattern scripts, and purposes. 18 months of half-page advert area allotted within the Perl magazine.

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Perl will decide at the time the variable is used whether the value should be interpreted as a number or string. This also extends to references: a reference can be a reference to another scalar, to an array or hash, or even to an object. To define or assign a value to a scalar variable, you must specify the value and the variable name with an equal sign (the operator). For example: $age = 26; This would store the value of 26 in the variable $age. The value assigned to the variable is called a literal because it is a static (noncomputed) value.

If it is set to non-zero, the filehandle (current, or specified) will be automatically flushed after each write operation. $, $OFS $OUTPUT_FIELD_SEPARATOR output_field_separator HANDLE EXPR The default output separator for the print series of functions. By default, print outputs the comma-separated fields you specify without any delimiter.

We go beyond the normal uses of these structures and look at other ways they can be employed to aid in the programming process. We also take the opportunity to examine references, which provide a different way of accessing and using information stored in variables, and this leads us on to nested data structures and object-oriented programming. This final section also leads to tied data structures—a system whereby information from an external source can be attached to an internal data structure.

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