#include <iostream>
#include <cstdlib>
using namespace std;

int main(int argc, char **argv)
{
	cout << "Please type an integer: ";
	int i;        //uninitialized variable
	cin >> i;     //cin.operator>>(i);

	if (!cin) {   //if (cin.operator!()) {
		if (cin.eof()) {
			cerr << argv[0] << ": end of input\n";
		}

		else if (cin.bad()) {
			cerr << argv[0] << ": can't input characters "
				"from the outside world\n";
		}

		else if (cin.fail()) {
			cerr << argv[0] << ": first non-whitepace character "
				<< "encountered was neither a digit,\n"
				<< "nor a minus sign followed by a digit.\n";
		}

		else {
			cerr << argv[0] << ": unknown input error\n";
		}

		return EXIT_FAILURE;
	}

	cout << "The integer was " << i << ".\n";
	return EXIT_SUCCESS;
}