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Last active October 20, 2015 01:16
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Simple Calculator chunk 4 - Constants
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simplecalc-4.md

Simple Calculator chunk 4 - Constants

Goal

Using Test Driven Development, expand your Stack class to handle the storage and retreival of constants.

  1. Prove that any lowercase letter of the alphabet can be a constant. (e.g. 'a' or 'x'). Constant names are case insensitive.
  2. Prove that your constants can only be defined once per session. Throw an exception otherwise.
  3. Prove you can defined constants can be used in math expressions.
  4. Prove that undefined constants can not be used and doing so throws an exception.

Hint

  • You can create a class Constants if you want, but it is not required. If you choose to create another class, the class must be unit tested.
  • Your Stack class should use the Constants class. ;)
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