_setbkcolor(short color)-Sets the background color when printing text. _settextcolor(short color)-Sets the color when printing text. int getche(void)-Get a single keystroke from the keyboard, and echo it. int getch(void)-Get a single keystroke from the keyboard. To briefly describe a few of the most useful functions: You can find documentation and library guides on the OpenWatcom project website to learn all about the unique DOS C programming libraries provided by the OpenWatcom C compiler. If you opted to install a "Plain DOS system," then you'll need to install the OpenWatcom C compiler afterward, using the FDIMPLES package manager. That's why we provide OpenWatcom on the FreeDOS LiveCD, so you can install it automatically if you choose to do a "Full installation including applications and games" when you install FreeDOS 1.3 RC4. 
The OpenWatcom C compiler is easier to install since it's only a single package. I like to write my C programs in the IA-16 port of GCC, or OpenWatcom, depending on what program I am working on. This provides a great deal of flexibility in writing more interesting programs. But DOS allows programs to access the console and video hardware.
You can directly access the console. On Linux, you can create text-mode mode programs that draw to the terminal screen using a library like ncurses. Thus, DOS programs used one of four memory models (large, medium, compact, and small) depending on how much memory they needed. You need to remain aware of how much memory you use. Linux allows programs to use lots of memory, but FreeDOS is more limited. Programming in C on FreeDOS is basically the same as C programming on Linux, with two exceptions: On the Bonus CD, you can also find DJGPP (a 32-bit C compiler based on GNU GCC) and the IA-16 port of GCC (requires a '386 or better CPU to compile, but the generated programs can run on low-end systems). The FreeDOS 1.3 RC4 LiveCD includes two C compilers-Bruce's C compiler (a simple C compiler) and the OpenWatcom C compiler. 
So it's probably not surprising that FreeDOS 1.3 RC4 includes a C compiler-along with other programming languages.
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