C++: Infinite loops from input validation

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65877677/c-infinite-loops-from-input-validation

Answer 1

What's happening in your code is that whenever you input a letter, cin keeps its invalid state for subsequent inputs, so you have to clear it and remove bad inputs first. So you can do something like this :

if (!(cin >> n)) {
    cout << "THE NUMBER INPUT IS NOT RECOGNISED AS AN INTEGER, TRY AGAIN." << endl;
    cin.clear();
    while(cin.get() != '
');
    n = 1;
  }