#include <iostream>
#include <iomanip>

using namespace std ;

int main()
{
    int i1= 0  ;
    cout << "Enter an integer1."  ;
    cin >> i1 ;
    //cout << "i1:" << i1 << endl ;

    //Once cin goes into an error state.
    //All bets are off
    cin.clear() ;
    cin.ignore(10000, '\n');
    cout << "Enter an integer2."  ;
    cin >> i1 ;
    cout << "i1:" << i1 << endl ;

     while( !std::cin  )
        {
           cin.clear() ;
           cin.ignore(10000, '\n');

           cout << "Enter an integer3."  ;
           cin >> i1 ;
        }

  return 0;
}