🔢 Big Number Calculator — High-Precision Calculator in Go

A simple yet powerful calculator built in Go that supports arbitrarily large numbers using math/big. Perform calculations like 100!, 2^100, √2, and high-precision division with ease. Comes with a clean web interface and a REST API.

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🛠️ Features

• ✅ Addition, subtraction, multiplication, division, power, factorial, square root
• ✅ Supports very large numbers via math/big
• ✅ High precision arithmetic (512-bit precision)
• ✅ Modern, responsive UI with light/dark mode toggle
• ✅ REST API + HTML frontend
• ✅ Unit and integration tests
• ✅ CI with GitHub Actions
• ✅ Makefile for easy automation

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🚀 How to Run

1. Clone the repository

git clone https://github.com/DanRulev/calculator.git
cd calculator

2. Download dependencies

go mod download

3. Start the server

go run cmd/main.go

Open in your browser: 🔗 http://localhost:8080

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📦 Tech Stack

• Go – Backend logic
• Gin – Web framework
• math/big – Arbitrary-precision arithmetic
• HTML/CSS/JavaScript – Frontend UI
• GitHub Actions – CI
• Makefile – Build automation

📄 License

This project is licensed under the MIT License – see the LICENSE file for details.