The compiler I am using is "Borland C++ Compiler 5.5" which I downloaded from http://www.borland.com. My OS is "Microsoft Windows 98". The source code I used is specifically for Borland compilers, so I really don't know what is wrong. Maybe it is the problem with my header...
I am studying "C for dummies", in case anyone wants to know. The book says that I have to "#include <dos.h>" to use the functions "sound()", "nosound()" and "delay()". But even when I include it, I get three different warning errors:
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