sicp 2.26

Exercise 2.26.  Suppose we define x and y to be two lists:

 

 

(define x (list 1 2 3))
(define y (list 4 5 6))

 

What result is printed by the interpreter in response to evaluating each of the following expressions:

 

 

(append x y)

(cons x y)

(list x y)

 

求值结果分别是：

(append x y)
->(1 2 3 4 5 6)

(cons x y)
->((1 2 3) 4 5 6)

(list x y)

->((1 2 3) (4 5 6))