1.1. exercise.rkt

#lang sicp
;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.

10
;10
(+ 5 3 4)
;12
(- 9 1)
;8
(/ 6 2)
;3
(+ (* 2 4) (- 4 6))
;6
(define a 3)
;a = 3
(define b (+ a 1))
;b = 4
(+ a b (* a b))
;19
(= a b)
;#f
(if (and (> b a) (< b (* a b)))
      b
      a)
;if b > a = true and b < a * b = true, then b, else, a
;b -> 4
(cond ((= a 4) 6)
      ((= b 4) (+ 6 7 a))
      (else 25))
;a = 4 -> false
;b = 4 -> true -> 6 + 7 + 3 = 16
;16
(+ 2 (if (> b a) b a))
;if (b > a) -> b
;2 + 4 = 6
;6
(* (cond ((> a b) a)
            ((< a b) b)
            (else -1))
      (+ a 1))
;a > b -> false
;a < b -> true -> b = 4
;a + 1 -> 4
; * 4 4 =
;16