Perl Error Message Variable
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Error Message $116.3 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An error message is information displayed when an unexpected condition occurs, usually on a computer or other device. On modern operating systems with graphical user interfaces, error messages are often displayed using dialog boxes. Error messages are used when user intervention is required, to indicate that a desired operation has failed, or to relay important warnings (such as warning a computer user that they are almost out of hard disk space). Error messages are seen widely throughout computing, and are part of every operating system or computer hardware device. Proper design of error messages is an important topic in usability and other fields of humancomputer interaction. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 184 Publication Date: 2011/02/14 Language: English Dimensions: 5.98 x 9.02 x 0.42 inches |
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On Perl: Perl for Students and Professionals $83.77 The book has an introductory chapter that gets the reader started quickly with programming in Perl. The initial part of the book discusses Perl expressions, statements, control flow, builtin data types such as arrays and hashes, and complex data structures built using references. On Perl has several chapters covering specialized topics. The chapter on socketbased network programming deals with forking and using fork to write complex interactive clientserver programs. There is a chapter with indepth discussion of CGI programming including errorhandling and security issues that arise. The chapter on webclient programming deals with writing programs that access Web pages, fill up GET and POST forms, handle cookies and redirected Web pages. The book has several unique chapters not found in any other book on Perl in the market. The chapter on security discusses hashes such as MD5, message authentication codes (MACs), digital signature schemes, and encryption techniques such as DES, Rijndael, and RSA. Other chapters deal with writing recursive programs that work with files and directories; this chapter also discusses predefined modules that deal with portability in file names and paths across operating systems, recursive traversal of file hierarchies and tarring and untarring of filles. The chapter on functional programming illustrates that Perl functions are firstclass, can be used to write closures and can be composed to form more complex functions. In particular, this can be useful for programming in artificial intelligence. Author: Kalita, Jugal K. Binding Type: Paperback Number of Pages: 660 Publication Date: 2004/01/01 Language: English Dimensions: 9.69 x 7.44 x 1.39 inches |
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Perl Best Practices $49.23 Presents guidelines on the art of coding with Perl, covering such topics as naming conventions, data and control structures, program decomposition, interface design, and error handling. |
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Perl Data Language $100.37 High Quality Content by WIKIPEDIA articles Perl Data Language is a set of array programming extensions to the Perl programming language. PDL is an extension to Perl v5, intended for scientific and other data intensive programming tasks. Perls data structures are intended for small to medium sized analysis tasks: they embody simple data structures and include considerable behindthescenes magic for type conversion, variable size, and the like. Numerical tasks such as image processing and computer modeling of physical systems require more structured data, and PDL supplies this need by including more traditional array constructs and additional syntax to describe vector processes. On a computer with both Perl and PDL installed, any Perl script can use the PDL functionality by declaring use PDL;. Like Perl, PDL is free software. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 152 Publication Date: 2010/07/21 Language: English Dimensions: 6.00 x 9.00 x 0.35 inches |
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Learning Perl (Paperback) $49.37 Popularly known as "the Llama," Learning Perl is the book most programmers rely on to get started with this versatile language. The bestselling Perl tutorial since it was first published in 1993, this sixth edition includes recent changes to the language up to Perl 5.14. This book reflects the combined experience of its authors, who have taught Perl at Stonehenge Consulting since 1991. Years of classroom testing and experience helped shape the book`s pace and scope, and this edition is packed with exercises that let you practice the concepts while you follow the text. Topics include: Perl data & variable types Subroutines File operations Regular expressions String manipulation (including Unicode) Lists & sorting Process management Smart matching Using third party modules Perl is the language for people who want to get work done. Originally targeted to sysadmins for heavy-duty text processing, Perl is now a full-featured programming language suitable for almost any task on almost any platform—from short fixes on the command line to web applications, bioinformatics, finance, and much more. Other books may teach you to program in Perl, but this book will turn you into a Perl programmer. |
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