#include <iostream>
#include <string>
#include <algorithm>

// 문자열 연산
std::string AddString(const std::string& num1, const std::string& num2)
{
    std::string result;
    int carry = 0;
    int len1 = num1.size();
    int len2 = num2.size();
    int maxLen = std::max(len1, len2);

    for (int i = 0; i < maxLen; ++i) {
        int digit1 = (i < len1) ? num1[len1 - 1 - i] - '0' : 0;
        int digit2 = (i < len2) ? num2[len2 - 1 - i] - '0' : 0;
        int addition = digit1 + digit2 + carry;
        carry = addition / 10;
        result.insert(result.begin(), (addition % 10) + '0');
    }

    if (carry) {
        result.insert(result.begin(), carry + '0');
    }

    return result;
}

int main() 
{
    std::string num1 = "123456789012345678901";
    std::string num2 = "123456789012345678901";

    std::string addition = AddString(num1, num2);
    std::cout << "Addition: " << addition << std::endl;

    return 0;
}

#include <iostream>
#include "MegaInt.h"

int main()
{
	MegaInt num1 = "123456789012345678901234567890";
	MegaInt num2 = "123456789012345678901234567890";

	MegaInt addition = num1 + num2;
	MegaInt subtraction = num1 - num2;
	MegaInt multiplication = num1 * num2;

	std::cout << "Addition: " << addition << std::endl;
	std::cout << "Subtraction: " << subtraction << std::endl;
	std::cout << "Multiplication: " << multiplication << std::endl;

}