c++ 乘法表 5.cpp

int main() {   srand(time(NULL));   vector> v = {         {"12 X 7 = ", 84},         {"12 X 8 = ", 96},         {"12 X 9 = ", 108},     {"12 X 11 = ", 132},         {"12 X 12 = ", 144},         {"13 X 4 = ", 52},     {"13 X 5 = ", 65},         {"13 X 6 = ", 78},         {"13 X 7 = ", 91},     {"13 X 8 = ", 104}};   random_device rd;   mt19937 g(rd());   shuffle(v.begin(), v.end(), g);   int answer;   for(int i = 0; i < v.size(); i++)   {     cout << v[i].first;     cin >> answer;     if(answer == v[i].second)       cout << "Correct!\n";     else       cout << "Wrong.\n";   }   return 0; }