Algorithm Inputs, Processes & Outputs (AQA GCSE Computer Science)
Revision Note
Written by: James Woodhouse
Reviewed by: Lucy Kirkham
Algorithm Inputs, Processes & Outputs
Applying algorithmic thinking leads to a set of precise step-by-step instructions that can solve a problem
To create an algorithm, the inputs, processes and outputs must be identified
What is an input?
An input is data or information being entered/taken into a program before it is processed in the algorithm
An input can come from a variety of sources, such as:
User - keyboard, mouse, controller, microphone
Sensors - temperature, pressure, movement
What is a process?
A process is a doing action performed in the algorithm that transforms inputs into the desired output. The central processing unit (CPU) executes the instructions that define the process
An example would be:
Comparing two numbers
Calculating an average
What is an output?
An output is the result of the processing in an algorithm and usually the way a user can see if an algorithm works as intended
An output can take various forms, such as:
Numbers - result of calculations
Text
Images
Actions - triggering events
Example 1 - Area of a shape
A user wants to write a program to calculate the area of a shape
Input | Process | Output |
|---|---|---|
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Example 2 - Average test score
A teacher wants to calculate the average mark achieved on a test amongst students in a class. The teacher needs to enter how many students in the class and for each students a score out of 50
Input | Process | Output |
|---|---|---|
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Worked Example
A bus company offers a discount to passengers if they have a valid 'student' card or are over 65 years of age.
Identify all the inputs that will be required in an algorithm to solve this problem [2]
Answer
Student card (YES/NO)
Age (integer)
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