This article is from the Mac Programming FAQ, by Jon Watte email@example.com with numerous contributions by others.
The existing Macintosh code base is mostly C, with C++ second, and
Pascal finding it's niche in third. Few people are writing mainstream
software in Pascal anymore, probably because (a) it's rather hard to
move to non-Mac platforms (b) Pascal is only rarely being taught past
the first year in Computer Science.