Interactive Examples (GNU Emacs Lisp Reference Manual)

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22.2.3 Examples of Using `interactive`

Here are some examples of interactive:

(defun foo1 () ; foo1 takes no arguments,
 (interactive) ; just moves forward two words.
 (forward-word 2))
 ⇒ foo1

(defun foo2 (n) ; foo2 takes one argument,
 (interactive "^p") ; which is the numeric prefix.
 ; under shift-select-mode,
 ; will activate or extend region.
 (forward-word (* 2 n)))
 ⇒ foo2

(defun foo3 (n) ; foo3 takes one argument,
 (interactive "nCount:") ; which is read with the Minibuffer.
 (forward-word (* 2 n)))
 ⇒ foo3

(defun three-b (b1 b2 b3)
 "Select three existing buffers.
Put them into three windows, selecting the last one."

 (interactive "bBuffer1:\nbBuffer2:\nbBuffer3:")
 (delete-other-windows)
 (split-window (selected-window) 8)
 (switch-to-buffer b1)
 (other-window 1)
 (split-window (selected-window) 8)
 (switch-to-buffer b2)
 (other-window 1)
 (switch-to-buffer b3))
 ⇒ three-b

(three-b "*scratch*" "declarations.texi" "*mail*")
 ⇒ nil