SICP is a very well known text teaching the conceptual basis of programming...
A computational process is indeed much like a sorcerer’s idea of a spirit. It cannot be seen or touched. It is not composed of matter at all. However, it is very real. It can perform intellectual work. It can answer questions. It can affect the world by disbursing money at a bank or by controlling a robot arm in a factory.
Here is the scheme style guide
(define (p) (p))
(define (test x y)
(if (= x 0)
0
y))Find the 2nd edition of this book here
