RPN Calculator

A terminal-based Reverse Polish Notation calculator built with Rust and Ratatui.

Features

• Arithmetic: +, -, *, /, ^, %
• Logarithmic: ln, log, exp, 10x
• Math Functions: sqrt, cbrt, abs, root, inv (1/x), ! (factorial)
• Constants: pi, e
• Trigonometry: sin, cos, tan, asin, acos, atan
• Stack Operations: swap, drop, clear, undo
• Interactive TUI with stack visualization and calculation history

Usage

cargo run

Controls

• Type numbers and press Enter to push to stack
• Type commands and press Enter to execute
• Single-character operators (+, -, *, /, ^, %, !) execute immediately
• q to quit, help for command list, Esc to clear stack

Example

Input: 5 4 +
Stack: [9]

Input: 3 *
Stack: [27]

Installation

git clone <repo-url>
cd rpncalc
./install.sh

Or for user-only installation:

cargo install --path .

Testing

cargo test

Requirements

• Rust 1.70+
• Terminal with Unicode support