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Beginning Perl by James Lee PDF

By James Lee

Originally created as a strong textual content processing instrument, Perl has given that advanced right into a multi-purpose, multi-platform language in a position to imposing quite a few projects comparable to method management, CGI and community programming, XML processing, and extra. Beginning Perl, moment Edition offers worthwhile perception into Perl's position in all of those projects and more.

Commencing with a accomplished evaluation of language fundamentals, you are going to study all approximately vital techniques similar to Perl's information kinds and keep an eye on move constructs. This fabric units the degree for a dialogue of extra advanced issues, reminiscent of writing customized services, utilizing typical expressions, and dossier enter and output. subsequent, we circulate directly to the complex subject matters of item orientated programming, modules, CGI programming, and database management with Perl's robust database interface module, DBI. The examples and code supplied provide you with the entire details you want to commence writing your personal strong scripts to unravel the issues indexed above, and lots of more.

Whether you're a entire amateur or an skilled programmer, Beginning Perl, moment Edition bargains an amazing advisor to studying Perl.

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1 $ CHAPTER 2 • SCALARS Let's have a look at one last pair of comparisons: we can check greater-than-or- equal-to and less-than-or-equal-to with the>= and<= operators respectively. pl print "Seven is less than or equal to sixteen? ", 7 <= 16, "\n"; print "Two is more than or equal to two? pl Seven is less than or equal to sixteen? Two is more than or equal to two? 1 1 $ There's also a special operator that isn't really a Boolean comparison because it doesn't give us a true-or-false value; instead it returns 0 if the two are equal, -1 if the right-hand side is bigger, and 1 if the left-hand side is bigger-it is denoted by<=>.

Velocity, for example, has a pair of coordinates (speed and direction), and so must be a vector. In Perl, a scalar is the fundamental, basic unit of data of which there are two kinds-numbers and strings. A literal is value that never changes. The value 5 is a scalar literal-and is literally 5; it can never be 4. 14159), and strings (for example "hello, world"). To put it another way, a literal is a constant-it never changes. As opposed to a variable which is a piece of memory that can hold a scalar value.

Pl See per ldoc per ldebug for information about the debugger. Summary We've started on the road to programming in Perl, and programming in general. We've seen our first piece of Perl code, and hopefully, you were able to get it to run. Programming is basically telling a computer what to do in a language it comprehends. It's about breaking down problems or ideas into byte-sized chunks (as it were), and examining what needs to be done in order to communicate them clearly to the machine. Thankfully, Perl is a language that allows us a certain degree of freedom in our expression, and, so long as we work within the bounds of the language, it won't enforce any particular method of expression on us.

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