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Calculator Exercise

Build a calculator command line interface (CLI) that allows a user to perform simple arithmetic.

Baseline

The program should ask the user for an operation (string or numeric symbol) and two numbers.

Primary Requirements

The program should use the input operation and two numbers to provide the result of applying the operation to the two numbers.

  • The program should have support for these four operations: addition, subtraction, multiplication, and division.
  • The program should accept both the name (add) and the symbol (+) for each possible operation.

Optional Enhancements

  • Print out the formula in addition to the result, i.e. 2 + 2 = 4
  • Add support for computing exponents (2^4 = 2 * 2 * 2 * 2 = 16).
  • Add support for the modulo operator (10 % 3 = 1).
  • Gracefully handle unexpected user input:
    • What happens if the user input is nil (i.e., the user just pressed enter)?
    • What happens if the user tries to add hotdog to elephant?
  • Make your program know when it needs to return an integer versus a float.
  • Add support for parentheticals, i.e. 10 / (5 + 5) = 1.

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