```Lisp

(defun draw_L_C (sp ep color)
  (command "line" sp ep "")
  (command "chprop" "l" "" "c" color "")
  (command "circle" "2p" sp ep)
  (command "chprop" "l" "" "c" (+ 1 color) "")
  (princ)

)

(defun c:exo3 ()
  (setvar "cmdecho" 0)
  (setq p1 (getpoint "\n>>첫점 입력 : "))
  (setq p2 (getpoint p1 "\n>>두번째점 입력 : "))
  (setq bc (getint "\n>>기준 색상 입력 : "))

  ; sub함수(draw_L_C) 외부파일로 저장했을경우 로드하는 로직 필요함
  ; (load "sub함수 예제") 
  (draw_L_C p1 p2 bc)

  (princ) 
)

```