Lisp / CLOS version of the code: https://gist.github.com/lispm/cb1e1c9fc75ad34624ed https://gist.github.com/lispm/cb1e1c9fc75ad34624ed CL-USER 72 > (calc)

Lisp / CLOS version of the code: https://gist.github.com/lispm/cb1e1c9fc75ad34624ed https://gist.github.com/lispm/cb1e1c9fc75ad34624ed CL-USER 72 > (calc) calc> 3+3+9 15 calc> 3*3 Error: parse error getting next token 1 (abort) calc toplevel 2 Return to level 0. 3 Return to top loop level 0. Type :b for backtrace or :c <option number> to proceed. Type :bug-form "<subject>" for a bug report template or :? for other options. CL-USER 73 : 1 > :c 1 calc> 10 10 calc> NIL