如何修复我的代码中的无限循环？ 我认为它跳过了第二个cin，所以它一直循环播放

Question

If i the input is not an int, it's going to give a infinite loop, i think it skips the second cin, but i don't know how to fix it.

cout << "Number of days : ";
int days;
cin >> days;
while(!cin){
    cout << "Invalid";
    cin >> days;
}

Answer 1

When operator>> fails to parse input, it puts the stream into an error state that you need to explicitly clear before you can read from the stream again, eg:

cout << "Number of days : ";
int days;
while (!(cin >> days)) {
    cin.clear();
    cin.ignore(numeric_limits<streamsize>::max(), '\n');
    cout << "Invalid";
}