큰 수 A + B (10757)

#include <iostream>
#include <string>
using namespace std;

int main()
{
	string A, B;
	cin >> A >> B;

	int aSize = A.length();
	int bSize = B.length();

	string Cal = "";
	int overnum = 0;

	while (aSize > 0 || bSize > 0)
	{
		int num1= 0;
		if (aSize > 0)
		{
			num1 = A[--aSize] - '0';
		}
		int num2 = 0;
		if (bSize > 0)
		{
			num2 = B[--bSize] - '0';
		}
		int Value = num1 + num2 + overnum;
		overnum = Value / 10;
		Value %= 10;
		char Val = Value + '0';
		Cal += Val;
	}
	if (overnum > 0)
	{
		Cal += overnum + '0';
	}
	string Result = "";
	for (int i = (int)Cal.length() - 1; i >= 0; --i)
	{
		Result += Cal[i];
	}

	cout << Result << "\n";
	return 0;
}