This is a very small and limited Lisp interpreter based on Andru Luvisi's. Its lightweightness is very useful in learning how Lisp and Scheme internals work!

It's a single C source file which you can run like this:

gcc sl3.c && ((cat corelib.lisp; cat /dev/stdin) | ./a.out )

This will compile the interpreter, load the corelib and get you ready with a "repl" where you can experiment. Once the interpreter is running, you could try

(+ 1 1) (cdr '(1 2)) (is-prime 103) (define X '(3 4 5)) (print 'first element 'of 'list 'X 'is (cdr X))