题解 | #特殊乘法#

利用str[i]-"0"来实现字符之间的乘法

#include <iostream>
using namespace std;

int main() {
	string num1;
	string num2;
	while (cin >> num1 >> num2)
	{
		int res = 0;
		for (int i = 0; i < num1.length(); i++) {
			for (int j = 0; j < num2.length(); j++) {
				res = res + (num1[i] - '0') * (num2[j] - '0');
			}
		}
		cout << res << endl;

		}
}