/*
Example programs from the book Scientific and Engineering Programming
in C++: An Introduction with Advanced Techniques and Examples,
Addison-Wesley, 1994.
 
                 (c) COPYRIGHT INTERNATIONAL BUSINESS MACHINES
                 CORPORATION 1994.  ALL RIGHTS RESERVED.

See README file for further details.
*/
#include <iostream.h>
int main() {

  int x;
  while (cin >> x) {
    if (x < 0) {
        cout << "Negative number " << x << " read" << endl;
        break;
    }
    // ... processing of input goes here
}

  return 0;
}