Wierd cin.fail() behavior

[ven0m]

Hey
I am a software engineering student and just started my C++ course.
I need help with understanding cin.fail() behavior. As far as i understood, doing some research on it, it returns true in case there is a failbit or a badbit.

Here i wrote a short program to test its behavior

#include <iostream>
using namespace std;

int main(){
	int temp;

	do{
		cin.clear();
		cin >> temp;
	}while(cin.fail());

	cout << temp;

}

My original intention was for it to prompt user for input once failbit was detected. However, for unknown reason it enters endless loop once i enter an illegal character. Could someone explain why? Thanks