A header-only C++ implementation of arbitrary-length integers. It is meant to provide a balance between ease of use and performance.
If you need maximum performance, use GMP instead (https://gmplib.org/).
#include "bigint.h"
int main() {
bigint a, b;
std::cin >> a >> b;
bigint c = a * b;
std::cout << (c >= 100 && c < 1000) << '\n';
c += a;
c *= 1000;
c /= b;
c %= 500000;
int64_t d = static_cast<int64_t> c;
std::cout << c << '\n';
}✅ Addition / Subtraction / Multiplication / Division / Modulo
✅ Relational Operators (==, !=, <, >, <=, >=)
✅ Mixed-type operations (bigint + int, etc...)
❌ Tests and benchmarks
❌ Base 2^32 or 2^64 representation
❌ Karatsuba multiplication
❌ Newton-Raphson division