Large Integer Arithmetic Calculator in C++

This project implements a high-precision integer calculator in C++ that supports basic and advanced arithmetic operations on numbers with up to 200 digits. All computations are done using strings to overcome limitations of built-in numeric data types (int, long, etc.).

Features

• Addition
• Subtraction
• Multiplication
• Division (integer division only)
• Power (exponentiation)
• Square root (integer approximation)
• Handles negative numbers and input validation

Highlights

• Built from scratch using only standard C++ (no external libraries)
• Simulates arithmetic logic with string manipulation
• Supports arbitrarily large integers (tested up to 200 digits)
• Displays a user-friendly interactive menu
• Handles edge cases like division by zero and 0⁰ correctly
• Modular functions: clean separation of logic for each operation

How to Run

1. Compile the code

g++ main.cpp -o bigcalc

2. Run the program

./bigcalc

You'll be prompted to select an operation and input the numbers interactively.

File Structure

main.cpp            # Complete source code
README.md           # Project documentation
calculate.exe       # compiled desktop app

Example Usage

-------------------------------------welcome----------------------------------
please choose one of these operators:
1. summation
2. submit
3. multiplication
4. division
5. power
6. square root

enter an integer number with maximum 200 digits:
...

Future Improvements

• Add floating-point support using fixed-point logic
• Improve square root precision using Newton-Raphson method
• Add modular arithmetic (useful in cryptography)

License

This project is open-source and free to use under the MIT License.

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Developed by Reza