By James Lee
Originally created as a robust textual content processing instrument, Perl has seeing that advanced right into a multi-purpose, multi-platform language able to imposing various initiatives equivalent to process management, CGI and community programming, XML processing, and extra. Beginning Perl, moment Edition presents precious perception into Perl's position in all of those projects and more.
Commencing with a entire review of language fundamentals, you will research all approximately vital techniques resembling Perl's information kinds and regulate circulate constructs. This fabric units the degree for a dialogue of extra advanced themes, resembling writing customized capabilities, utilizing usual expressions, and dossier enter and output. subsequent, we circulation directly to the complex themes of item orientated programming, modules, CGI programming, and database management with Perl's robust database interface module, DBI. The examples and code supplied give you the entire details you want to commence writing your personal robust scripts to unravel the issues indexed above, and lots of more.
Whether you're a whole beginner or an skilled programmer, Beginning Perl, moment Edition deals an awesome advisor to studying Perl.
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Additional resources for Beginning Perl
Number 4 is 100, 5 is 101, and so ad infmiturn. If we got used to it, and we used the binary system naturally, we could count up to 1023 on our fingers. This may sound like an abnormal way to count, but even stranger counting mechanisms are all around us. m. , which seems unremarkable. But that's a base 60 system. In fact, it's worse than that-it doesn't stay in base 60, because hours carry at 24 instead of 60. Anyone who's used the Imperial measurement system, a Chinese abacus, or pounds, shillings, and pence knows the full horror of mixed base systems, which are far more complicated than what we're dealing with here.
The second line of this program is a blank line. Perl, like C, C++, and many other programming languages, treats blank lines, extra spaces, and tabs as whitespace. In Perl, whitespace can be added to the program to make it more readable. \n"; The print () function tells Perl to display the given text, without the quotation marks. The text inside the quotes is not interpreted as code, and is called a string. As we'll see later, strings start and end with some sort of quotation mark. " This instructs Perl to finish the current line and take the prompt to the start of a new one.
Hello, ! On the surface of things, it may seem that we have just given ourselves another line of output, but bear in mind that the first line is now a warning message, and is informing us that Perl has picked something up that may (or may not) cause problems later on in our program. Don't worry if you don't understand everything in the error message at the moment, just so long as you are beginning to see the usefulness of having an early warning system in place. 6. For backward compatibility, we will stick with the -w option.
Beginning Perl by James Lee