Variables, Constants & Assignments (AQA GCSE Computer Science)

Revision Note

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James Woodhouse

Written by: James Woodhouse

Reviewed by: Lucy Kirkham

Taking an algorithm and turning it into code, in any language, requires an understanding of several basic programming concepts such as:

  • Variables

  • Constants

  • Assignment

Variables, Constants & Assignments

What is a variable?

  • A variable is a named memory location that holds data that during the execution of a program, the data can change

  • Variables can store a variety of different types of data such as numbers, text or true/false values

  • To store data in a variable, the process of assignment is used

What is a constant?

  • A constant is fixed data that during the execution of a program cannot change

  • A constant can store a variety of different types of data, similar to variables

  • Pi is an example of a mathematical fixed value that would typically be stored as a constant

What is assignment?

  • Assignment is the process of storing data in a variable or constant under a descriptive name

  • Assignment is performed using the '=' symbol

Assigning variables & constants

Concept

Pseudocode

Python

Variables

x  ← 3

name  ← "Save My Exams"

x = 3

name = "Save My Exams"

Constants

CONSTANT vat  ← 0.2

CONSTANT pi  ← 3.142

VAT = 0.2

PI = 3.142

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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.

Lucy Kirkham

Author: Lucy Kirkham

Expertise: Head of STEM

Lucy has been a passionate Maths teacher for over 12 years, teaching maths across the UK and abroad helping to engage, interest and develop confidence in the subject at all levels.Working as a Head of Department and then Director of Maths, Lucy has advised schools and academy trusts in both Scotland and the East Midlands, where her role was to support and coach teachers to improve Maths teaching for all.