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Create a directory structure, and a couple of classes, in different packages, to demonstrate the differences between default and protected access rules Create a class, a subclass, and a sub-subclass Create at least two constructors in each class and use super() and this() to access (one way or another) all of the constructors, based on invoking new() on the grandchild class Create a class that uses static initialization blocks, instance initialization blocks and a constructor, and prove the sequence in which they get called when the class is invoked and a new object is created Create a 2D array and a 3D array Copy the 2D array into a part of the 3D array Create an enum that has a variable, a constructor, a method, and a constant class body Create a class that exercises each of the enum s members Create a class, a subclass, and a sub-subclass:

foreach $symname (sort keys %main::) { local *symbol = $main::{$symname}; print "\$$symname is defined\n" if defined $symbol; print "\@$symname is defined\n" if defined @symbol; print "\%$symname is defined\n" if defined %symbol; }

You can also use the symbol table to define static scalars by assigning a value to a typeglob:

*C = 299792458;

n Make overridden versions of methods in those classes n Make an array of instances of the three and loop through them

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You now cannot modify $C, the speed of light, since the variable $C does not really exist Perl is just allowing us to access a typeglob as a scalar value Note that uppercase is used for the constant, even though normally the speed of light is specified as c This is a convention in Perl Constants and filehandles are typically in uppercase, variables and functions are lowercase, and package names are specified in title case Although this is convention, Perl doesn t really care!

Prefixing the @ operator to a function invocation suppresses any error messages that function might generate However, this @ operator should only be used as a last resort in production code, as it can create a great deal of confusion when you re trying to track down bugs at a later date A more general approach to error display might be to set PHP s global error reporting level to E_ERROR, which turns off the display of all non-fatal errors However, parse errors, which occur due to syntactical errors in PHP code, cannot be controlled via this setting, and will continue to display regardless of the error reporting level You can turn off the display of all errors (including fatal errors) by setting the error reporting level to E_NONE, as in the following example:

Perl has reserved a number of specially named blocks that provide some additional control over the execution of your script although these are more complex topics, we ll cover them here, as their execution will help you to understand how modules and importing and exporting objects works The four blocks are BEGIN, CHECK, INIT, and END, and they are executed in that order When you execute a Perl script, any BEGIN blocks are executed during the parsing process that is, as soon as the statements within a BEGIN block have been parsed and verified The CHECK block is executed as soon as the parsing and compilation stages have been completed, but before the actual execution of the script The INIT block runs before the main flow of the program starts The END blocks execute when the program terminates If you specify more than one of these blocks in your script, they are executed in the order in which they are parsed in the case of BEGIN and CHECK, and in reverse order in the case of INIT and END, and still in the overall order given above You can see this better using a simple script:

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