Variables have a certain reach within a program. A global variable can be used anywhere in a program, but a local variable is known only in a certain area (function, loop)
Sometimes the word scope is used in projects: “its outside the scope of the project”, meaning not included. Likewise, a variable can be outside the scope of a function.
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In the program below, balance is a global variable. It can be used anywhere in the code. But the variable x can only be used inside addAmount.
We have two variables: balance, a global variable that can be used anywhere. x, that can only be used inside the function (its not known outside, local scope).
Try the exercises below:
- Add a function reduce amount that changes the variable balance
- Create a function with a local variable