AnswersIntroduction to Information Technology - EL3701Variables and Data Types

Variables and Data Types Answers

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1
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Which of these are characteristics of variables? Check all that apply.

A
Variables can be local or global.
B
Variables cannot be changed.
C
Variables have keys and values within brackets [ ].
D
Variables have connected sets of characters.
E
Variables have names, extents, and scopes.
2
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A(n) ✔ arrayuser-defined typeabstract data type is a group of scalar or individual values that are stored in one entity.

A
✔ array
B
user-defined type
C
abstract data type
3

A(n) scalararray✔ user-defined typeabstract data type is a data type that is assigned a true or false value by a programmer.

A
scalar
B
array
C
✔ user-defined type
D
abstract data type
4

A(n) scalararrayuser-defined type✔ abstract data type is a data type that can be assigned multiple values.

A
scalar
B
array
C
user-defined type
D
✔ abstract data type
5

NumbersTuples✔ ListsStrings are sets of data separated by a comma between two brackets [ ].

A
Numbers
B
Tuples
C
✔ Lists
D
Strings
6

Which of the following are characteristics of global variables? Check all that apply.

A
They are accessible from anywhere in the program.
B
They are accessible only in specific regions of a program.
C
They are accessible only within a declared function.
D
They are accessible during the entire time the program is running.
7

Use the drop-down menus to correctly complete these sentences about how variables can be defined.✔ Scalar valuesArraysUser-defined typesAbstract data types are single numbers or values, which may include integers, floating-point decimals, or strings of characters.

Answers:
are single numbers or values, which may include integers, floating:Scalar values
is a group of scalar or individual values that are stored in one entity.:array
is a data type that is assigned a true or false value by a programmer.:user-defined type
is a data type that can be assigned multiple values.:abstract data type
8

Use the drop-down menus to correctly complete these sentences about common data types.A variable that is used in programming and can hold a true or false value is a(n) global✔ Booleancharacterinteger data type.

Answers:
data type.:Boolean
data type.:alphanumeric string
data type.:integer
data type.:floating-point number
9

Which of these are characteristics of a Python data type? Check all that apply.

A
A Python data type is weakly typed.
B
A Python data type can have numeric values.
C
A Python data type can be shown by keys and values within brackets [ ].
D
A Python data type must be stated before it can be used in a program.
E
A Python data type can be a string, a list, or a tuple with items that can be repeated using the asterisk ( * ).
F
A Python data type can be a dictionary that can be updated, changed, or removed.
G
A Python data type cannot have connecting sets of characters separated by commas.
10

Use the drop-down menu to correctly complete these sentences about the five standard Python data types.✔ NumbersStringsListsTuples are numeric values in Python data types.

Answers:
are numeric values in Python data types.:Numbers
is a large and changeable list that can contain any number of Python objects.:dictionary
are connected sets of characters separated by quotation marks " ".:Strings
are sets of data separated by a comma between two parenthesis ( ).:Tuples
are sets of data separated by a comma between two brackets [ ].:Lists
11

Which of these are correctly formatted Python lists? Check all that apply.

A
list1=(race, cars, trucks, bikes)
B
list2=[‘computer science’, ‘math’, ‘psychology’]
C
list3=[“Programming 101”, “Intro to Python”]
D
list4=(‘summer’, ‘fall’, ‘winter’, ‘spring’)
E
list5=[52, 24, 71, 72, 56]
12

Which of these are correctly formatted Python dictionaries? Check all that apply.

A
dict = {‘Name’: ‘Matthew’, ‘Age’: 14, ‘School’: ‘ABC School’};
B
dict = (‘Name’: ‘Mary’, ‘Age’: 13, ‘School’: ‘XYZ School’)
C
dict = [“Programming Basics”, “Introduction to Python”]
D
dict = {‘season’: ‘fall’, ‘weather’: ‘cool’};
E
dict = ’[‘laptop’, ‘computer’, ‘hard drive’]
13

Which of these are correctly formatted Python tuples? Check all that apply.

A
tup1=(‘computer science’, ‘math’, ‘psychology’)
B
list1=[“final”, “complete”, “finish”]
C
tup2=“Programming 101”, “Intro to Python”
D
tup3=[“MacBook”, “Dell”, “IBM”]
E
tup4=(‘laptop’, ‘computer’, ‘hard drive’)
14

Question text not available

Answers:
is a data type that is assigned a true or false value by a programmer.:user-defined type
is a data type that can be assigned multiple values.:abstract data type
15

A variable that can hold a mixed sequence of letters and numbers is a(n) ✔ alphanumeric stringBooleanfloating-point numberlocal data type.

A
✔ alphanumeric string
B
Boolean
C
floating-point number
D
local
16

A stringtuple✔ dictionarynumber is a large and changeable list that can contain any number of Python objects.

A
string
B
tuple
C
✔ dictionary
D
number
17

A variable that can hold positive or negative whole-number values is a(n) globalcharacter✔ integerBoolean data type.

A
global
B
character
C
✔ integer
D
Boolean
18

NumbersLists✔ StringsTuples are connected sets of characters separated by quotation marks " ".

A
Numbers
B
Lists
C
✔ Strings
D
Tuples
19

A variable that can be used with moveable decimal points is a(n) alphanumeric stringdictionarycharacter✔ floating-point number data type.

A
alphanumeric string
B
dictionary
C
character
D
✔ floating-point number
20

Lists✔ TuplesNumbersStrings are sets of data separated by a comma between two parenthesis ( ).

A
Lists
B
✔ Tuples
C
Numbers
D
Strings

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