J277.2.2.2.Use of data types

J277.2.2.2.Use of data types

by Mr. Shingari

​Walt

​Choose suitable data types for data in a given scenario

​Understand that data types may be temporarily changed through casting, and where this may be useful

​Practical use of the data types in a high-level language within the classroom

​Wilf

​I can choose suitable data types for data in a given scenario

Multiple Choice

What is a Boolean data type?

• A set of alphanumeric characters
• A number that may have a fractional component
• A whole number
• A value that is true or false, -1/1 or 0

Multiple Choice

In this line of code: x = f.endOfFile(), what data type is x?

• Real
• String
• Integer
• Boolean

Multiple Choice

In this line of code: x = 6 < 3, what data type is x?

• String
• Boolean
• Integer
• Real

Multiple Choice

What data type should be used for storing the name of a person?

• Real
• Integer
• String
• Boolean

Multiple Choice

What is a string data type?

• A whole number
• A set of alphanumeric characters
• A value that is true or false, -1/1 or 0
• A number that may have a fractional component

Multiple Choice

What data type should be used for storing an average?

• String
• Boolean
• Real
• Integer

Multiple Choice

What is meant by the term casting?

• A string with a single alphanumeric character
• A character that represents an action
• Converting a variable from one data type to another
• A value that does not change whilst the program is running

Multiple Choice

What is an integer?

• A number that may have a fractional component
• A whole number
• A value that is true or false, -1/1 or 0
• A set of alphanumeric characters

Multiple Choice

In this line of code: FOR counter = 1 to 10 what data type should counter be declared as?

• Boolean
• Integer
• String
• Real

Multiple Choice

What is a real number?

• A number that may have a fractional component
• A whole number
• A set of alphanumeric characters
• A value that is true or false, -1/1 or 0

Multiple Choice

What data type should be used for storing a telephone number?

• Real
• Integer
• Boolean
• String

Multiple Choice

Which of these data structures is most appropriate for storing a complete record?

• Boolean
• Array
• String
• Real

Multiple Choice

Casting refers to:

• Boolean algebra

• Rounding of reals

• Converting between variable data types

• Printing out of the program’s results

Multiple Select

What is a variable?

Answers: 2

• A value stored in a region of memory using an identifier.

• The value can change during the duration of the program running.

• The value can not change during the duration of the program running.

Multiple Select

What is a constant?

Answers: 2

• A value stored in a region of memory using an identifier.

• The value can change during the duration of the program running.

• The value can not change during the duration of the program running.

Multiple Choice

Variables are defined using which operator

• =

• ==

Multiple Choice

Which of the following is a constant?

• const vat = 2

• vat = 2

Multiple Select

Which of the following are logical operators

Answers: 3

• AND

• OR

• NOT

• DIV

• MOD

Multiple Choice

Which of the following adds?

• +

• -

• *

• /

Multiple Choice

Which of the following subtracts?

• +

• -

• *

• /

Multiple Choice

Which of the following multiplies?

• +

• -

• *

• /

Multiple Choice

Which of the following performs integer division?

• DIV

• MOD

• ^

• /

Multiple Choice

Which of the following performs integer division and finds the remainder?

• DIV

• MOD

• ^

• /

Multiple Choice

Which is the equal to operator

• =

• !=

• ==

Multiple Choice

Which is the assignment operator

• =

• !=

• ==

Multiple Choice

Which is the greater than operator

• <

• <=

• >=

• >

Multiple Choice

Which is the greater than or equal to operator

• <

• <=

• >=

• >

Multiple Select

Which of the following would ask for an input and store it so it can be used later?

Answers: 2

• input("prompt to user")

• input()

• variable = input("prompt to user")

• variable = input()

Multiple Select

Which of the following is a valid print statement?

Answers: 2

• print("Hello World")

• print "Hello World"

• variable = "Hello World"

  print (variable)

• variable = "Hello World"

  print variable

• variable = "Hello World"

  print(Hello World)

Multiple Choice

Choose the appropriate data type of this variable:

PlayerName e.g. “John Smith”

• Integer

• Real

• String

• Boolean

Multiple Choice

Choose the appropriate data type of this variable:

BestScore e.g. 5000

• Integer

• Real

• String

• Boolean

Multiple Choice

Choose the appropriate data type of this variable:

WorstScore e.g. 109

• Integer

• Real

• String

• Boolean

Multiple Choice

Choose the appropriate data type of this variable:

AverageScore e.g. 3437.5

• Integer

• Real

• String

• Boolean

Multiple Choice

Choose the appropriate data type of this variable:

GameCompleted e.g. False

• Integer

• Real

• String

• Boolean

Multiple Choice

Choose the appropriate data type of this variable:

Difficulty e.g. "M"

• Integer

• Real

• String

• Char

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​Wilf

​Practical use of the data types in a high-level language within the classroom

​Variable data types

​Challenge booklet- Page 9 to page 10

​

​Extension:

​Make the python program of the challenges on page 11. Question 5 to Question 7.