Global variables and constants

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• 8 sections of explanation, worked examples and diagrams
• 1 practice task with hints and worked answers
• A quiz that marks itself as you go
• Your progress kept across every subject you take

Other lessons in this sub-strand

1. Functions and modular programming
2. Parameter passing and variable scope
3. Why modular programming
4. Built-in functions in practice
5. Writing a function definition
6. Parameters: giving a function data
7. Return values: getting a result back
8. Functions calling functions
9. Formal and actual parameters
10. Local variables in practice
11. Global variables and constants
12. Value-returning and void functions
13. Building a modular program
14. The roles of functions