The full importance of variables will become clear in the context of scripts, but they can also be very useful when Hypatia is just used as a calculator.
Hypatia's variables can only be numbers, not arrays.
Using Variables: Hypatia's Variables, Variable Names, Creating a Variable, The $myvar = Assign Command, The STO Command, The SHOW Command, Deleting a Variable.
Saving Variables: The SAVE Command, The Saved Variables File Format, Retrieving Variables.
User-Defined Constants: User Constants Are Variables, Defining Your Own Constants, Constants as Insert Files.
Next Chapter: Insert Files and User Defined Elements