;; Review questions help you review the material. They are *not*
;; sample questions for either in-class or takehome part of the test. 

;; is this a correct definition?
(define (x y z) (* y (+ z 5)))

;; if yes, what will be printed?
(x 2 3)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; Define a function that, given a number of hours h, minutes m, and
;; seconds s, computes the total number of seconds in the time
;; interval.
;; Example: given h = 10, m = 15, s = 20, the expected value is
;; 36920


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


;; Contract: number -> symbol
;; Purpose: to determine how good a GPA is. The function returns symbols as
;; follows:
;; 'InAcademicTrouble if the GPA is < 2.0, 
;; 'MapEligible if GPA >= 3.0 and
;; 'DeansList if GPA is >= 3.5.
;; you may assume that you are given a number

(define (how-good-is-GPA? gpa) 
  (cond
      [(< gpa 2.0) 'InAcademicTrouble] 
      [(>= gpa 3.0) 'MapEligible]
      [(>= gpa 3.5) 'DeansList]
  )
)

;; does the function work as intended? 


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


;; Write a function that converts letter grades into their
;; corresponding GPA contribution: A=4, B=3, C=2, D=1.
;; All other grades contribute 0.
;; Grades are represented by symbols: 'A, 'B, etc
;; For simplicity we assume no + or - grades. All letters are
;; upper-case. 

;; Write a function that takes four letter-grades
;; and computes GPA for the semester
;; Use the function that you wrote for the previous question.


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


;; define a structure card that has a suit (a symbol 'Spades, 'Hearts, 
;; 'Diamnods, 'Clubs) and a numeric value 2, 3, .., 10, 11 (= J), 
;; 12 (= Q), 13 (= K), 14 (= A)

;; define a function "match?" that takes two cards and returns true if they have 
;; the same suit or the same value (or both), false otherwise

;; define an "isValidCard?" function that takes a card structure and 
;; returns true if the card has a valid suit and a valid value and
;; false otherwise. Your function must not fail on any data.