Not Quite C

Not Quite C (NQC) is a programming language, application programming interface (API), and native bytecode compiler toolkit for the Lego Mindstorms, Cybermaster and LEGO Spybotics systems. It is based primarily on the C language but has specific limitations, such as the maximum number of subroutines and variables allowed, which differ depending on the version of firmware the RCX has. The language was invented by David Baum. He has released two books on the subject.

Simple program example
A simple test program written in NQC for an RCX with a motor connected to output port A could look like this: Thus, motor A will go at full speed for two seconds before being turned off.

Compilers and integrated development environments
NQC compilers and integrated development environments (IDEs) are available for many platforms including Microsoft Windows, Mac OS X, Linux, BeOS, and MS-DOS. One is the Bricx Command Center.