/* handling incorrect interactive user input of numbers and end-of-file */
/* One technique...  RJB Oct 2001 */

#include <iostream>
#include <string>


int main()
{
	cout << "Please input some integers and finish with -1\n";

	int in; //the input numbers
	string junk; // used to grab non digits
	bool done; // true when end of file is founs/input

	cin >> in; done = cin.eof(); //read ahead

	while(cin.fail() && !done)
	{
		cin.clear(); cin>>junk;
		cerr <<"\nError: "<<junk<<" is not a number. Try again\n";
		cin >> in; done = cin.eof();
	}// !cin.fail or done

	while(in != -1 && !done)
	{
	   while(cin.fail())
	   {
		cin.clear(); cin>>junk;
		cerr <<"\nError: "<<junk<<" is not a number. Try again\n";
		cin >> in; done = cin.eof();
	   }// not cin.fail

	   cout << "\n" << in << "\n";
	   cin >> in; done = cin.eof();
	}// in==-1 or done

	if(done)
		cout << "EOF"<<endl;
	else
		cout << "sentinel -1... thanks\n";

}//main