CSCI-2041: Advanced Programming
Principles 2024 – 2025 CSCI-2041
Final Exam Practice Questions with
and Answers | 100% Pass Guaranteed
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CS 2041: Practice Final
Fall 2018
University of Minnesota
Exam period: 20 minutes
Points available: 40
Background: OCaml’s standard library has muta- 1 # let table = Hashtbl.create 20;;
ble, polymorphic hash table implementation which 2 # Hashtbl.add table "Goku" 8001;;
maps keys to values in the Hashtbl module which 3# Hashtbl.add table "Krillin" 1770;;
4# Hashtbl.add table "Piccolo" 3500;;
is demonstrated in a REPL nearby. Like the tree
5 # Hashtbl.add table "Vegeta" 18000;;
maps we created, Hashtbl provides higher-order 6
func- tions for operating on the key/value 7 # let kpower = Hashtbl.find_opt table "Krillin";;
associations in the map. 8 val kpower : int option = Some 1770
9 # let gpower = Hashtbl.find_opt table "Gohan";;
Problem 1 (5 pts): Write a function print_all 10 val gpower : int option = None
which prints out all key/value bindings in a hash ta- 11
12 # #use "hash_funcs.ml";;
ble of string/integers. Use the higher-order function 13 val print_all : (string, int) Hashtbl.t -> unit = <fu
Hashtbl.iter func tbl where func is passed keys 14 val total_power : (’a, int) Hashtbl.t -> int = <fun>
and values from the hash table and returns unit. It 15
is demonstrated in the REPL session. 16 # print_all table;; (* demo print_all *)
17 Krillin -> 1770
18 Vegeta -> 18000
Write your code for print_all here.
19 Piccolo -> 3500
20 Goku -> 8001
21 - : unit = ()
22
23 # total_power table;; (* demo total_power *)
24 - : int = 31271
Problem 2 (5 pts): Write a function Write your code for total_power here.
total_power which totals the values stored in a
hash table with integer values. Use the higher-order
func- tion Hashtbl.fold func tbl initial where
func is passed keys, values, and a running total. It
is demonstrated in the REPL session.
Problem 3 (5 pts): A5’s Calculon drew a distinction between a lambda expression and a closure.
Describe the similarities and differences between these two things.
2A
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