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"ALBUM by ARTIST". Finally, computers should be "Public Computer". You may find the OCaML function string_of_int: int -> string helpful. Example Outputs # string_of_item (Book ("Types and Programming Languages", "Benjamin Pierce"));; -: string = "Types and Programming Languages by Benjamin Pierce" # string_of_item (Movie ("The Imitation Game", 2014)) ;; string= "The Imitation Game (2014)" # string_of_item Computer;; - string = "Public Computer" 2.2 string_of_entry checkout_entry -> string The second function you must implement converts checkout_entry to a string. An normal Item shall be rendered just as the wrapped catalog_item would be. A new entry should be rendered as "(NEW) ENTRY", where ENTRY is the wrapped checkout_entry. A pair should be "ENTRY1 and ENTRY2", where ENTRY1 and ENTRY2 are the items. In implementing this function, you may wish to call the string_of_item function you previously wrote. Example Outputs # string_of_entry (Item (Book ("Types and Programming Languages", "Benjamin Pierce"))) ;; - string = "Types and Programming Languages by Benjamin Pierce" #string_of_entry (New (Item (Movie ("The Imitation Game", 2014)))) ;; -: string = "(NEW) The Imitation Game (2014)" 2.3 daily_fine checkout_entry -> float The third function you must implement computes the fines (in dollars) incurred for each day an item is overdue. The fines are as follows: • Books: 0.25 • Movie: 0.50 • CD: 0.50 • Computer: 0.00 • New Items: Double the normal fine • Pair: The sum of the fines for each item 2.4 total fine: checkout list -> float The fourth function you will implement takes a list of checkout and returns the total fine for all items. Remember, if the int option is None, the item is not overdue and thus no fines are due for that item. You may find float_of_int : int -> float helpful in implementing this function.

"ALBUM by ARTIST". Finally, computers should be "Public Computer". You may find the OCaML function string_of_int: int -> string helpful. Example Outputs # string_of_item (Book ("Types and Programming Languages", "Benjamin Pierce"));; -: string = "Types and Programming Languages by Benjamin Pierce" # string_of_item (Movie ("The Imitation Game", 2014)) ;; string= "The Imitation Game (2014)" # string_of_item Computer;; - string = "Public Computer" 2.2 string_of_entry checkout_entry -> string The second function you must implement converts checkout_entry to a string. An normal Item shall be rendered just as the wrapped catalog_item would be. A new entry should be rendered as "(NEW) ENTRY", where ENTRY is the wrapped checkout_entry. A pair should be "ENTRY1 and ENTRY2", where ENTRY1 and ENTRY2 are the items. In implementing this function, you may wish to call the string_of_item function you previously wrote. Example Outputs # string_of_entry (Item (Book ("Types and Programming Languages", "Benjamin Pierce"))) ;; - string = "Types and Programming Languages by Benjamin Pierce" #string_of_entry (New (Item (Movie ("The Imitation Game", 2014)))) ;; -: string = "(NEW) The Imitation Game (2014)" 2.3 daily_fine checkout_entry -> float The third function you must implement computes the fines (in dollars) incurred for each day an item is overdue. The fines are as follows: • Books: 0.25 • Movie: 0.50 • CD: 0.50 • Computer: 0.00 • New Items: Double the normal fine • Pair: The sum of the fines for each item 2.4 total fine: checkout list -> float The fourth function you will implement takes a list of checkout and returns the total fine for all items. Remember, if the int option is None, the item is not overdue and thus no fines are due for that item. You may find float_of_int : int -> float helpful in implementing this function.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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OCaml Code: Make sure to show the full code and take a screenshot of the output. Make sure to use various test cases as well. There must be no error in the code at all. Make sure the code prints out all of the example outputs that is circled in the image attached. 

 

"ALBUM by ARTIST". Finally, computers should be "Public Computer". You may find the OCaML function string_of_int: int -> string helpful. Example Outputs # string_of_item (Book ("Types and Programming Languages", "Benjamin Pierce")) ;; - : string = "Types and Programming Languages by Benjamin Pierce" # string_of_item (Movie ("The Imitation Game", 2014)) ;; -: string = "The Imitation Game (2014)" #string_of_item Computer;; string = "Public Computer" 2.2 string_of_entry checkout_entry -> string The second function you must implement converts checkout_entry to a string. An normal Item shall be rendered just as the wrapped catalog_item would be. A new entry should be rendered as "(NEW) ENTRY", where ENTRY is the wrapped checkout_entry. A pair should be "ENTRY1 and ENTRY2", where ENTRY1 and ENTRY2 are the items. In implementing this function, you may wish to call the string_of_item function you previously wrote. Example Outputs #string_of_entry (Item (Book ("Types and Programming Languages", "Benjamin Pierce"))) ;; - string = "Types and Programming Languages by Benjamin Pierce" # string_of_entry (New (Item (Movie ("The Imitation Game", 2014)))) ;; - string "(NEW) The Imitation Game (2014)" 2.3 daily_fine: checkout_entry -> float The third function you must implement computes the fines (in dollars) incurred for each day an item is overdue. The fines are as follows: • Books: 0.25 • Movie: 0.50 • CD: 0.50 • Computer: 0.00 • New Items: Double the normal fine • Pair: The sum of the fines for each item 2.4 total fine checkout list -> float The fourth function you will implement takes a list of checkout and returns the total fine for all items. Remember, if the int option is None, the item is not overdue and thus no fines are due for that item. You may find float_of_int: int -> float helpful in implementing this function.
Transcribed Image Text:"ALBUM by ARTIST". Finally, computers should be "Public Computer". You may find the OCaML function string_of_int: int -> string helpful. Example Outputs # string_of_item (Book ("Types and Programming Languages", "Benjamin Pierce")) ;; - : string = "Types and Programming Languages by Benjamin Pierce" # string_of_item (Movie ("The Imitation Game", 2014)) ;; -: string = "The Imitation Game (2014)" #string_of_item Computer;; string = "Public Computer" 2.2 string_of_entry checkout_entry -> string The second function you must implement converts checkout_entry to a string. An normal Item shall be rendered just as the wrapped catalog_item would be. A new entry should be rendered as "(NEW) ENTRY", where ENTRY is the wrapped checkout_entry. A pair should be "ENTRY1 and ENTRY2", where ENTRY1 and ENTRY2 are the items. In implementing this function, you may wish to call the string_of_item function you previously wrote. Example Outputs #string_of_entry (Item (Book ("Types and Programming Languages", "Benjamin Pierce"))) ;; - string = "Types and Programming Languages by Benjamin Pierce" # string_of_entry (New (Item (Movie ("The Imitation Game", 2014)))) ;; - string "(NEW) The Imitation Game (2014)" 2.3 daily_fine: checkout_entry -> float The third function you must implement computes the fines (in dollars) incurred for each day an item is overdue. The fines are as follows: • Books: 0.25 • Movie: 0.50 • CD: 0.50 • Computer: 0.00 • New Items: Double the normal fine • Pair: The sum of the fines for each item 2.4 total fine checkout list -> float The fourth function you will implement takes a list of checkout and returns the total fine for all items. Remember, if the int option is None, the item is not overdue and thus no fines are due for that item. You may find float_of_int: int -> float helpful in implementing this function.
In this assignment you are asked to implement portions of the checkout system backend for the Oakland, California Municipal Library (OCaML). You will be writing functions to handle calcu- lating fines for overdue items. Your implementations must adhere to a specified behavior and type (or signature). These functions will operate on a set of three nested data types representing the library's records. The data types representing records are defined as follows: type catalog_item = Book of string * string | Movie of string * int | CD of string * string | Computer type checkout_entry = Item of catalog_item | New of checkout_entry | Pair of checkout_entry * checkout_entry type checkout Checkout of checkout_entry * int option These definitions are also provided in the file library.ml which you can use as a basis for your development. Note that constructor names must begin with a capital letter, and binding names must begin with a lowercase letter (or an underscore). Here a catalog_item represents one physical item in the library. For a book, the parameters are the title and author. For a movie, the parameters are title and year. For a CD, the parameters are the album name and artist. Computer represents using a public computer, and thus has no arguments. Some items are new or can only be checked out as a pair with another item. A checkout_entry represents one checked out bundle. Finally, a checkout combines a checkout_entry with an integer option representing the number of days overdue. If the option is None, the item is not overdue. If the option is Some n, n is the number of days the item is overdue. You may assume n is always positive. 2 Function specifications 2.1 string_of_item : catalog_item -> string The first function you will implement converts a catalog_item to a string. Books shall be rendered as "TITLE by AUTHOR". A movie shall be "TITLE (YEAR)". A CD shall be rendered as
Transcribed Image Text:In this assignment you are asked to implement portions of the checkout system backend for the Oakland, California Municipal Library (OCaML). You will be writing functions to handle calcu- lating fines for overdue items. Your implementations must adhere to a specified behavior and type (or signature). These functions will operate on a set of three nested data types representing the library's records. The data types representing records are defined as follows: type catalog_item = Book of string * string | Movie of string * int | CD of string * string | Computer type checkout_entry = Item of catalog_item | New of checkout_entry | Pair of checkout_entry * checkout_entry type checkout Checkout of checkout_entry * int option These definitions are also provided in the file library.ml which you can use as a basis for your development. Note that constructor names must begin with a capital letter, and binding names must begin with a lowercase letter (or an underscore). Here a catalog_item represents one physical item in the library. For a book, the parameters are the title and author. For a movie, the parameters are title and year. For a CD, the parameters are the album name and artist. Computer represents using a public computer, and thus has no arguments. Some items are new or can only be checked out as a pair with another item. A checkout_entry represents one checked out bundle. Finally, a checkout combines a checkout_entry with an integer option representing the number of days overdue. If the option is None, the item is not overdue. If the option is Some n, n is the number of days the item is overdue. You may assume n is always positive. 2 Function specifications 2.1 string_of_item : catalog_item -> string The first function you will implement converts a catalog_item to a string. Books shall be rendered as "TITLE by AUTHOR". A movie shall be "TITLE (YEAR)". A CD shall be rendered as
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