What is the difference between a variable and a constant?

A variable can change during the program's lifetime, whereas a constant is set once and is never reassigned.

How should a variable identifier be written?

In mixed case (Pascal case) , starting with a capital letter and not a digit.

What happens when a variable is declared?

Memory is allocated based on the data type indicated.

A variable can be associated with a when it is declared.

A variable can be associated with a datatype when it is declared.

Why do constants help a program?

They aid the readability and maintainability of the code.

True or False? A constant can be reassigned during execution.

False. Constants are not reassigned during execution. They are fixed values used throughout the algorithm.

What are arithmetic operators used for?

To perform basic maths operations in a program, such as adding, subtracting, multiplying and dividing values.

Which operator gives the remainder after division?

MOD . For example, 10 MOD 3 gives 1 .

Which operator is used for exponentiation?

^ . For example, 3 ^ 3 gives 27 .

What does the + operator do when used with strings?

It performs concatenation . For example, "John" + " " + "Doe" gives "John Doe" .

Arithmetic operators follow operator , so multiplication happens before addition.

Arithmetic operators follow operator precedence , so multiplication happens before addition.

What does 2 + 3 * 4 evaluate to, and why?

14 , because multiplication is carried out before addition under operator precedence.

What does (2 + 3) * 4 evaluate to?

20 , because the brackets are evaluated first.

What are logical operators used for?

To compare values . They return either TRUE or FALSE , and are commonly used in conditions and loops.

True or False? In 9618 pseudocode, != means 'not equal to'.

False. The 9618 operator for 'not equal to' is <> .

Name the two operators that combine a comparison with equality.

>= meaning greater than or equal to, and <= meaning less than or equal to.

A LevelComputer ScienceCambridge (CIE)Flashcards11. ProgrammingProgramming Basics

Programming Basics (Cambridge (CIE) A Level Computer Science): Flashcards

Exam code: 9618

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FrontPseudocode Basics
Define variable.

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Cards in this collection (24)

Define variable.
A variable is an identifier that can change during the lifetime of a program.
Define constant.
A constant is an identifier that is set once in the lifetime of a program.
What is the difference between a variable and a constant?
A variable can change during the program's lifetime, whereas a constant is set once and is never reassigned.
How are constants usually named?
In all uppercase characters.
How should a variable identifier be written?
In mixed case (Pascal case), starting with a capital letter and not a digit.
What happens when a variable is declared?
Memory is allocated based on the data type indicated.
A variable can be associated with a when it is declared.
A variable can be associated with a datatype when it is declared.
What is the pseudocode syntax for declaring a constant?
CONSTANT <identifier> ← <value>
Write pseudocode to declare a constant Pi with the value 3.14159.
CONSTANT Pi ← 3.14159
Why do constants help a program?
They aid the readability and maintainability of the code.
True or False?
A constant can be reassigned during execution.
False.
Constants are not reassigned during execution. They are fixed values used throughout the algorithm.
What are arithmetic operators used for?
To perform basic maths operations in a program, such as adding, subtracting, multiplying and dividing values.
Which operator gives the remainder after division?
MOD. For example, 10 MOD 3 gives 1.
Which operator is used for exponentiation?
^. For example, 3 ^ 3 gives 27.
What does the + operator do when used with strings?
It performs concatenation. For example, "John" + " " + "Doe" gives "John Doe".
Arithmetic operators follow operator , so multiplication happens before addition.
Arithmetic operators follow operator precedence, so multiplication happens before addition.
What does 2 + 3 * 4 evaluate to, and why?
14, because multiplication is carried out before addition under operator precedence.
What does (2 + 3) * 4 evaluate to?
20, because the brackets are evaluated first.
What are logical operators used for?
To compare values. They return either TRUE or FALSE, and are commonly used in conditions and loops.
Which pseudocode operator means 'not equal to'?
<>
True or False?
In 9618 pseudocode, != means 'not equal to'.
False.
The 9618 operator for 'not equal to' is <>.
Name the two operators that combine a comparison with equality.
>= meaning greater than or equal to, and <= meaning less than or equal to.
x is 5 and y is 10.
What does x < y evaluate to?
TRUE
x is 5 and y is 10.
What does x >= y evaluate to?
FALSE

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