#+INCLUDE: ../header.org
* Code
#+INCLUDE: "./code-buttons.org"


You can display code and/or the results of code execution for many
languages. 

Define an =add= code block:
#+NAME: add
#+BEGIN_SRC emacs-lisp
  (+ 1 2 3 4)
  #+END_SRC

Insert the result of calling the =add= code block:
#+CALL: add()

Define a =reverse= function:
#+BEGIN_SRC emacs-lisp
  (defun reverse (list)
    (let (value)
      (dolist (elt list value)
        (setq value (cons elt value)))))
  #+END_SRC

Insert a block that uses =reverse= and displays the results:
#+BEGIN_SRC emacs-lisp :exports both :results value
(reverse (list 1 2 3 4))
  #+END_SRC

Call the =menu= code block in =header.org= to insert another copy of the menu:
#+CALL: menu() :results html