A simple BigInt library for C++. Note that, at least for now, the emphasis is on ease of use, not speed or performance.
#include <iostream>
#include "BigInt.h"
int main()
{
BigInt big1("10000000000"); // Values can be arbitrarily large
BigInt big2("30000000000");
BigInt big3 = big1 + big2;
std::cout << big3 << std::endl;
std::cout << 1234 + big1 * 18 * big2 * 2 << std::endl;
return 0;
}
Compiling and running this example (note that C++11 is required) displays
40000000000
10800000000000000001234