Recover from C++ istream failure sample
The code is not coded in a standard way where it would altogether avoid the problem but does exhibit the recover from C++ istream failure which occur in a while loop. void main_menu(){ int condition = 1; int input = 0; do { cout << "please input an integer\n"; if(cin.fail()) { //if it encounter a fail state which is error type. it will ignore the buffer //associate with istream cin.ignore(100); cin.clear(); //reset the fail state to be good } cin >> input; fflush(stdin); //fflush alone not suffice for some reason thou it works on scanf if (input == 1) { cout << "Hello World\n"; condition=0; system("Pause"); } else { condition=1; } } while (condition == 1 ); }