Big Integer

Introduction

This is an experimental big integer library.

Supported platforms

• Windows
• Ubuntu (may work on other Linux or POSIX platforms)

Supported operations

• Arithmetic operations (+, -, *, / and %)
• Arithmetic assignment operations (+=, -=, *=, /=, %=)
• Bitwise operations (&, |, ^, <<, >>)
• Bitwise assignment operations (&=, |=, ^=, <<=, >>=)
• Unary operations (+, -, ~)
• Comparison (==, !=, >, >=, <, <=)
• Conversion from string
• Conversion to string

Unit tests

Unit tests are available. More test cases may be added in the future.

Sample application

An example application, which is a simple command line calculator, is provided.

Compiling the source code

CMakeLists.txt files are provided. CMake is required to generate the project files or Make files.

Constraints

• Only basic operations are supported.
• Thread safety is not provided.
• The internal implementations may not be optimized.
• Not suitable for embedded system applications due to dynamic memory allocations during runtime.

Implementation details

• The internal representation is std::vector<uint64_t>.
• The big integer is represented as a two's complement binary number.