The examples displayed on these web pages are written in either the C or the BASIC language, unless otherwise stated in the example presented. So a good C compiler or a good Basic compiler (or interpreter) is required if you want to try the examples yourself. Particular brand of compiler is for the most part a personal preference. I use Turbo C++ 3.0 to compile all of the examples that I use in the book, but I certainly do not expect people to own a copy of this so I try to make the source code as portable as possible. I've even recompiled a lot of the examples using Microsoft Visual C++ 1.0 compiler in order to make them available to a wider range of compilers.
I do not recommend trying to code up the examples on these pages using the free compiler that Borland is offering in their museum (Turbo C version 2). It cannot do C++ at all and the C compiler itself has a more limited library than what is available in TC++ 3. Obviously Borland gave it away because it is practically useless in my opinion and you will certainly get better mileage on this page by using Pacific C. I think Borland should do the programming community a favor and offer TC++ 3.0 for free rather than continue to try to push in in their Turbo C Development Suite package, but this is just my opinion.
The BASIC examples are done using Microsoft's QuickBASIC and some of them may work in QBasic that comes with MS-DOS 5.0 and later. As far as using other BASIC compilers, you're pretty much on your own there. My apologies for this but I do not find the BASIC language on a whole to be that useful for doing low level programming tasks. Some people are able to use Power Basic as a better QBasic replacement that supports low level tasks much better.
