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Here's how the files in this program should probably be organized once design patterns are used.

Order of Operations

PEMDAS is a helpful guide for learning the order of operations, but is not precise enough for a computer. Here's this program's order of operations:

1. Operators within parentheses
2. Factorial
3. Exponent*
4. Negation
5. Multiplication and Division
6. Addition and Subtraction
7. Modulo
8. Equality and Inequality
9. Assignment

*Unlike the other operators, the exponent operator's precedence with itself is from right to left, e.g. 2^3^4 = 2^(3^4).