2. Variables

• Variables are references to memory regions that you define to use in the program.

• The variables F and C from the previous example are references to memory regions.

• The variables F and f are different, just as C and c are.

• "F" or "C" are not variables.

2.1. Variables with defined and undefined values

• You can only use the content of a variable if it already has a defined value.

• If you use a variable that has no defined value or is undefined, it would result in an error like the following.

x = 42 print(x) print(y)

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