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21.2.3 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:")
         (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