Data Types (Cambridge (CIE) IGCSE Computer Science)

Revision Note

Robert Hampton

Written by: Robert Hampton

Reviewed by: James Woodhouse

Data Types

What is a data type?

  • A data type is a classification of data into groups according to the kind of data they represent

  • Computers use different data types to represent different types of data in a program

  • The basic data types include:

Data type

Used for

Pseudocode

Example

Integer

Whole numbers

INTEGER

10, -5, 0

Real

Numbers with a fractional part (decimal)

REAL

3.14, -2.5, 0.0

Character 

Single character

CHAR

'a', 'B', '6', '£'

String

Sequence of characters

STRING

"Hello world", "ABC", "@#!%"

Boolean

True or false values

BOOLEAN

True, False

  • It is important to choose the correct data type for a given situation to ensure accuracy and efficiency in the program

  • Data types can be changed within a program, this is called casting

Programming data types

Data type

Pseudocode

Python

Integer

Number ← 5

number = 5

Real

RealNumber ← 3.14

realNumber = 3.14

Character 

FirstNameInitial ← "a"

firstNameInitial = "a"

String

Password ← "letmein"

password = "letmein"

Boolean

LightSensor ← True

lightSensor = True

Worked Example

Name and describe the most appropriate programming data type for each of the examples of data given. Each data type must be different

[6]

Data: 83

Data: [email protected] 

Data: True

Answers

  • Data type name: Integer [1]
    Data type description: The number is a whole number [1]

  • Data type name: String [1]
    Data type description: It is a group of characters [1]

  • Data type name: Boolean [1]
    Data type description: The value is True (or could be False) [1]

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Robert Hampton

Author: Robert Hampton

Expertise: Computer Science Content Creator

Rob has over 16 years' experience teaching Computer Science and ICT at KS3 & GCSE levels. Rob has demonstrated strong leadership as Head of Department since 2012 and previously supported teacher development as a Specialist Leader of Education, empowering departments to excel in Computer Science. Beyond his tech expertise, Robert embraces the virtual world as an avid gamer, conquering digital battlefields when he's not coding.

James Woodhouse

Author: James Woodhouse

Expertise: Computer Science

James graduated from the University of Sunderland with a degree in ICT and Computing education. He has over 14 years of experience both teaching and leading in Computer Science, specialising in teaching GCSE and A-level. James has held various leadership roles, including Head of Computer Science and coordinator positions for Key Stage 3 and Key Stage 4. James has a keen interest in networking security and technologies aimed at preventing security breaches.