Question: Provide named constants that you really cant change the value of. You have to add a member to Variable that distinguishes between constants and variables

Provide named constants that you really can’t change the value of. You have to add a member to Variable that distinguishes between constants and variables and check for it in set_value(). If you want to let the user define constants (rather than just having pi and e defined as constants), you’ll have to add a notation to let the user express that, for example, const pi = 3.14;.

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