L1-025 正整数A+B

题目
使用了c++的输入输出相关函数简化了处理

#include 
#include 
#include 
using namespace std;
int right(const string& str) {
	if (!str.size()) return 0;
	for (int i = 0; i < str.size(); ++i)
		if (str[i] < '0' || str[i] > '9') return 0;
	int t = stoi(str);
	if (t < 1 || t > 1000) return 0;
	return 1;
}
int main() {
	string A, B;
	getline(cin, A, ' ');
	getline(cin, B);
	if (right(A) & right(B) && stoi(A) > 0) {
		cout << A << " + " << B << " = " << stoi(A) + stoi(B);
	}
	else {
		if (right(A)) cout << A;
		else cout << '?';
		cout << " + ";
		if (right(B)) cout << B;
		else cout << '?';
		cout << " = ?";
	}
	//cout << right(A) << endl << right(B);

	return 0;
}