IDEs
To program the RCX brick in C++, you will need to download the Bricx IDE which is only for PC's. Mac users have to use the usual editor/command line approach.
BricxCC - http://bricxcc.sourceforge.net
Programming the RCX brick in C++, requires using the BrickOS programming language. BrickOS allows us to program the RCX brick in C++, as well as offer some improvements over the standard firmware on the RCX brick. However, it is still in its developmental stages. For more information, look at http://brickos.sourceforge.net.
To program the RCX brick in C++, you will need to download the Bricx IDE which is only for PC's. Mac users have to use the usual editor/command line approach.
BricxCC - http://bricxcc.sourceforge.net