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be significantly quicker Interpreted code also tends to be smaller and easier to distribute The disadvantages are that the original source must be supplied in order to execute the program, and an interpreted program is generally slower than a compiled executable because of the way the code is executed Perl fits neither of these descriptions in the real sense The internals of Perl are such that at the time of executing a Perl script, the individual elements of the script are compiled into a tree of opcodes Opcodes are similar in concept to machine code the binary format required by the processor in your machine However, whereas machine code is executed directly by hardware, opcodes are executed by a Perl virtual machine The opcodes are highly optimized objects designed to perform a specific function When the script is executed you are essentially executing compiled C code, translated from the Perl source This enables Perl to provide all the advantages of a scripting language while offering the fast execution of a compiled program This mode of operation translation and then execution by a virtual machine is actually how most modern scripting languages work, including Java (using Just In Time technology) and Python Keeping all of that in mind, however, there have been some advances in the most recent versions of a Perl compiler that takes native Perl scripts and converts them into directly executable machine code We ll cover the compiler and Perl internals later in this book

We already know that Perl has its history in a number of different languages It shares several features and abilities with many of the standard tools supplied with any Unix workstation It also shares some features and abilities with many related languages, even if it doesn t necessarily share the same heritage With regard to specific features, abilities, and performance, Perl compares favorably against some languages and less favorably against others A lot of the advantages and disadvantages are a matter of personal preference For example, for text handling, there is very little to choose between awk and Perl However, personally I prefer Perl for those tasks that involve file handling directly within the code, and awk when using it as a filter as part of a shell script

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What is the result A 1 1 B 1 2 C 2 1 D 2 2 E F An exception is thrown at runtime Compilation fails due to a single error

Perl has a very simple attitude toward function arguments In C, Pascal, and other languages the specification of a function is fixed, both in the form of the data types that can be supplied and the total number of arguments Although C supports the varargs option, this is the exception, rather than the rule Within Perl you can pass any type of argument and any number of arguments to a function (unless you ve prototyped the function see the Prototypes section later in this chapter) For most situations, this is an incredibly practical solution to the problem of argument passing

What actually happens is that the arguments you supply to a subroutine are placed into the @_ array This means that the first argument you pass to the subroutine is available within the function as $_[0], the second argument is $_[1], and so on For example, this simple function adds two numbers and prints the result:

sub add { $result = $_[0] + $_[1]; print "The result was: $result\n"; }

G Compilation fails due to multiple errors Answer (for Objective 53): F is correct The removeRange() method is protected and so cannot be accessed from the MyUtil2 class The rest of the code is legal A, B, C, D, E, and G are incorrect based on the above

To call the subroutine and get a result,

add(1,2);

The preceding subroutine is fairly simple, but what if you wanted to have named arguments The simple answer is to assign the values of @_ to a list of variables:

60 Given:

sub add { ($numbera, $numberb) = @_; $result = $numbera + $numberb; print "The result was: $result\n"; }

Note the syntax here we re assigning a list of values (from @_) to a list of variables ($numbera and $numberb) so we must supply a list of variables, enclosed in parentheses so that each value in @_ is assigned to a corresponding variable Finally, because we probably don t want to create those variables in the global name space, we ought to use my to declare them all locally:

sub add { my ($numbera, $numberb) = @_; my $result = $numbera + $numberb; print "The result was: $result\n"; }

See the Scope section later in this chapter for information on the effects of my and the other scoping mechanisms

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