13.1 User-defined data types

Question 1

Why are user-defined data types necessary?

Answer 1

Necessary as it allows the user to create data types that are custom to their required needs.

Question 2

Difference between a composite data type vs non-composite?

Answer 2

non-composite data type = defined without reference to another data type. Not iterable, no functions, immutable.

composite data type = built from other data types. e.g. List.

Question 3

Define an enumerated data type

Answer 3

nc
TYPE Rating = (1 .. 10)
DECLARE Happiness : Rating
Happiness ← 9

from enum import Enum, auto
class Lunch(Enum):
    noodles = auto()
    rice = auto ()

today = Lunch(1)

Question 4

Define a pointer

Answer 4

nc
TYPE MyPointer = ^INTEGER
DECLARE variable1 : MyPointer
variable^ ← variable2
variable1 ← @variable3
variable1 ← variable2^   (@ memory location var2)
variable ← variable3

Question 5

Define a set

Answer 5

c
DECLARE MyThings : SET OF STRING
MyThings ← {“phone”, “laptop”, “camera”}

my_things = {“phone”, “laptop”, “camera”}
my_things.intersection(your_things) is A AND B
my_things.union(your_things) is A OR B

Question 6

Define a record

Answer 6

c
TYPE ThingOfWonder
  DECLARE Thought : STRING
  DECLARE Prize : INTEGER
ENDTYPE

class ThingOfWonder:

def __init__(self):

self. Thought = ""
self. Prize = 0

Question 7

Define a class for a person with a property name

Answer 7

class Person:           
  def \_\_init\_\_(self, name):
    self.\_\_name = name

  def set_name(self, new_name):
    self.\_\_name = new_name

  def get_name(self);
    return self.\_\_name

Question 8

Define a child class for person called ReallyImportantPerson

Answer 8

class ReallyImportantPerson(Person):
  def \_\_init\_\_(self, name, title):
    super().\_\_init\_\_(name)
    self.\_\_title = title

  def get_name(self):
    return super().get_name() + "IS MY NAME!"