Variables, Constants & Assignments (AQA GCSE Computer Science)
Revision Note
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 |
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Variables |
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Constants |
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