iostream ctime vector tring using namespace std; int main() { ????srand(time(NULL)); ????int random = rand() % 4; ????vector v{"12 X 7 = ", "12 X 8 = ", "12 X 9 = ", "12 X 11 = "}; ????int answer; ????while(1) ????{ ????????switch(random) ????????{ ????????????case 1: cout << v[0]; cin >> answer; if( answer == 84) cout << "Correct!\n"; else cout << "Worng."; ????????????case 2: cout << v[1]; cin >> answer; if( answer == 96) cout << "Correct!\n"; else cout << "Worng."; ????????????case 3: cout << v[2]; cin >> answer; if( answer == 108) cout << "Correct!\n"; else cout << "Worng."; ????????????case 4: cout << v[3]; cin >> answer; if( answer == 132) cout << "Correct!\n"; else cout << "Worng."; ????????} ????}; }