🧮 Math Gone Wild: Expression Calculator

A robust C# command-line utility for evaluating complex mathematical expressions. The engine converts standard infix notation into RPN (Reverse Polish Notation) for high-precision calculation.

🚀 Quick Start

Prerequisites: Visual Studio 2022+

1. Open the solution file in Visual Studio.
2. Build the project (Ctrl+Shift+B).
3. Run via CLI:

Interactive mode

RpnOne

Process a file

RpnOne [inFile]

Help

RpnOne -h

🛠️ The Eval() Engine

The core logic resides in the Eval() method, which processes math expressions through a three-stage pipeline to ensure high precision:

1. Tokenize(): Segments the input string into operands, operators, and functions.
2. InfixToPostFix(): Converts standard notation into Reverse Polish Notation (RPN) using the Shunting-yard algorithm.
3. EvalPostFix(): Executes the calculation by processing the RPN stack.

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🔢 Operator Reference

Category	Operators	Examples
Basic	+, -, *, /, %, ^, @ (Negate)	15 % 3, 3 ^ 2
Trig	SIN, COS, TAN, ACOS, ASIN, ATAN	COS(RAD(45))
Roots/Log	SR (Sqrt), CR (Cube), RT (Nth), LN, LG	RT(38, 4)
Theory	GCF, LCM, PD (Prime Divisor), !	GCF(3, 21)
Probability	NCR, NPR, ND, CDF, STU	NCR(6, 2)
Constants	PI, TAU, EN (Euler's Number)	6 * PI
Rounding	CL (Ceiling), FL (Floor), RD, I (Int)	CL(7.25)
Other	DEG, RAD, RAN (Int), RND (0-1)	RAD(180)

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💻 Programmatic Binding

You can inject variables into expressions dynamically at the source level using the Util class. This is perfect for automation or templated math.

var str = "A * B - C";
Util util = new Util();

// Bind values to placeholders
string result = util.Bind(str, "A", 22.1);
result = util.Bind(result, "B", 17.4);
result = util.Bind(result, "C", 66.45);

// Final output: "22.1 * 17.4 - 66.45"