(+ 1 2)
(* 1 10)
'(this is my first lisp learn in emcas lisp)
(this is my first lisp learn in emacs lisp)
下面将是学习内部求值
(+ (+ 1 2) 2)

(concat "Hello" "World")
(substring "Hello World" 2 5)

1.8.2
(+ 4 fill-column)

1.8.5
(message "Hello %s!" "me")
!


1.9 计数器
(setq counter 0)
(setq counter (+ counter 2))
(message "Now counter is %d" counter)
