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12 cards from this deck
Subroutines that calculate and return a value
Subroutines that carry out tasks without returning anything
Functions return a result, procedures just do something
Sends a value back to the main program from a function
Variables created inside a function
Variables only exist inside their specific function
Causes an error - local variables only exist inside function
Break large program into smaller, manageable chunks
Use function multiple times without rewriting code
Update code in one place only
Clear inputs (parameters) and outputs (return values)
Makes code organised, reusable, and easier to maintain
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