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Define constant.
Define variable
What is a global variable?
What is a local variable?
What is an identifier?
What is a reserved word/keyword?
What are the differences between constants and variables?
What does 'initialising variables' mean?
How can you use constants to maintain a program?
When naming constants and variable, what should you do?
How can you lay out code to make it more maintainable?
Why should programmers use these programming techniques?
