M-x run-lisp would bring
*inferior-lisp* buffer. In a lisp mode buffer, you can put the cursor behind the line or region you want to evaluate, and press
C-M-x. The content would be sent to
Experimenting with Lisp(CCL)
(+ 2 3)
Anything in parentheses is a list. First element is treated as the name of a function and the rest of the elements as expressions to be evaluated to yield the arguments to the function.
The printer tries to print objects in the same syntax the reader understands.