SICP - Solution: Exercise 1.1

September 23, 2018

Exercise 1.1 #

Below is a sequence of expressions. What is the result printed by the interpreter in response to each expression? Assume that the sequence is to be evaluated in the order in which it is presented.

Solution #

The result of evaluating each expression is shown after the > below:

10
> 10

(+ 5 3 4)
> 12

(- 9 1)
> 8

(/ 6 2)
> 3

(+ (* 2 4) (- 4 6))
> 6

(define a 3)
>

(define b (+ a 1))
>

(+ a b (* a b))
> 19

(= a b)
> #f

(if (and (> b a) (< b (* a b)))
    b
    a)
> 4

(cond ((= a 4) 6)
      ((= b 4) (+ 6 7 a))
      (else 25))
> 16

(+ 2 (if (> b a) b a))
> 6

(* (cond ((> a b) a)
         ((< a b) b)
         (else -1))
   (+ a 1))
> 16