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Perl itself is written in C (You can download and view the Perl source code if you so wish, but it s not for the faint-hearted!) Many of the structures and semantics of Perl and C are very similar For example, both use semicolons as end-of-line terminators They also share the same code block and indentation features However, Perl tends to be stricter when it comes to code block definitions it always requires curly brackets, for example but most C programmers will be comfortable with the Perl environment Perl can be object oriented like C++ Both share the same abilities of inheritance, polymorphism, and encapsulation However, object orientation in Perl is easier to use, compared to the complexities of constructors and inheritance found in C++ In addition to all this, there is no distinction between the standard and object-oriented implementations of Perl as there is with C and C++ This means you can mix and match different variables, objects, and other data types within a single Perl application something that would be difficult to achieve easily with C and C++ Because Perl is basically an interpreted language (as mentioned earlier), development is generally quicker than is writing in native C Perl also has many more built-in facilities and abilities that would otherwise need to be handwritten in C/C++ For example, regular expressions and many of the data-handling features would require a significant amount of programming to reproduce in C with the same ease of use available in Perl Because of Perl s roots in C, it is also possible to extend Perl with C source code and vice versa: you can embed Perl programs in C source code

Our initial view of the display of ratios (and the color-coding) of directories and files was that they d be static, which was why the DirectoryNode stored the ratio rather than calculating it when needed. In retrospect, this was a poor decision, since we knew we d want to delete files later. Mea culpa. After exploring updating the ratio when necessary (an ugly task), we decided to have the DirectoryNode store a reference to the corresponding baseline DirectoryNode and then calculate the ratio when it was requested.1 The change to the DirectoryNode class simplifies the code elsewhere, and the percentages are now updated correctly. Another problem appears, however; the pie chart coding of the icons doesn t get updated correctly when a file is deleted. A look at the current code shows that the form calculates the fraction when the tree is populated. Adding code to update this and to get it right seems to be decidedly nontrivial. An alternate approach is to have a file or directory calculate the fraction directly, based on the parent s size. Doing this will require that files and directories be able to easily get to their parents, and the easiest way to do that is to add a Parent property to the BaseNode class. This enables calculating the fraction on the fly and finally allows you to get the behavior you want. It also allows a directory or file to be able to delete itself from the parent directory, which eliminates the code that walked the tree to do this.

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Although a lot of syntax is different, awk, and gawk (the GNU projects version) are functionally subsets of Perl It s also clear from the history of Perl that many of the features have been inherited directly from those of awk Indeed, awk was designed as a reporting language with the emphasis on making the process of reporting via the shell significantly easier Without awk, you would have to employ a number of external utilities, such as cut, expr, and sort, and the solution would be neither quick nor elegant There are some things that Perl has built-in support for that awk does not For example, awk has no network socket class, and it is largely ignorant of external files,

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