Hi, I would like to be able to evaluate simple expressions such as (1 + 2 + 3) in Scheme, but currently my program only accepts 2 arguments: (1 + 2). Here is the link to the program: http://pastebin.com/833425 The program is executed as follows: (calculate '(1 + 2)), which will output 3. What do I need to do to make it work for expressions of any lenght? Help is appreciated.

For some reason, pastebin has not been working properly for me, so here is another link for the program: http://rafb.net/paste/results/HWbSz...

Use paste.lisp.org: http://paste.lisp.org/display/30792 I added a test in the cond of calculate which will be needed if you amend math-eval-combo as suggested.