C and C++
Peter Naulls' www.riscos.info
A definitive site on C programming for RISC OS. Contains helpful thinks
like how to get the free GNU C compiler installed and running, first
compilations, comparisons of compilers, the 26/32-bit issue, etc. Top site.
The "C for Yourself" series
By David Matthewman and Steve Mumford, published in Acorn User,
these are considered to be an extremely friendly introduction to C.
Paul Johnson's "C From The Top" and "C The Wimp" series
A long-running series from Archive Magazine. Very thorough, and
therefore can be a bit daunting or confusing at times. But you may find
things here which are only glossed over in the "C for Yourself" articles.
And the rest ...