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

Fill in the Blank

AverageScore variable stores average score of a player so, The number has a fractional part / a decimal place. Which data type is suitable for this variable?

Fill in the Blank

what data type is numA?

Fill in the Blank

what data type is numA i?

Fill in the Blank

what data type is total s?

Fill in the Blank

Give the line number in which casting occurs in the example program.

Fill in the Blank

Give the line number in which casting occurs in the example program.

​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

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​Extension:

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