Combining Boolean Operators (Edexcel GCSE Computer Science)
Revision Note
Written by: James Woodhouse
Reviewed by: Lucy Kirkham
Combining Boolean Operators
Boolean operators can be combined to produce more complex expressions
The combination of two or more Boolean operators forms a logic expression
Brackets are used to clarify the order of operations
A logic diagram is a visual representation of combinations of Boolean operators within a logic circuit
An example would be Q = NOT(A OR B)
In the diagram above, the inputs are represented by A and B
P is the output of the OR gate on the left and becomes the input of the NOT gate
Q is the final output of the logic circuit
This is a logic diagram for the Boolean expression Q = NOT(A OR B)
Examiner Tips and Tricks
You may be asked to draw a logic circuit from a logic statement or a Boolean expression OR write the logical expression that is expressed in the logic diagram
Logic circuits will be limited to a maximum of three inputs and one output
Example of combining Boolean operators
P = (A OR B) AND NOT C
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