text: /* The following code example is taken from the book
   * "The C++ Standard Library - A Tutorial and Reference"
   * by Nicolai M. Josuttis, Addison-Wesley, 1999
   *
   * (C) Copyright Nicolai M. Josuttis 1999.
   * Permission to copy, use, modify, sell and distribute this software
   * is granted provided this copyright notice appears in all copies.
   * This software is provided "as is" without express or implied
   * warranty, and with no claim as to its suitability for any purpose.
   */
  #include <cstdlib>
  #include <iostream>
  using namespace std;
  
  int main()
  {
      double x, y;        // operands
  
      // print header string
      cout << "Multiplication of two floating point values" << endl;
  
      // read first operand
      cout << "first operand:  ";
      if (! (cin >> x)) {
          /* input error
           *  => error message and exit program with error status
           */
          cerr << "error while reading the first floating value"
               << endl;
          return EXIT_FAILURE;
      }
  
      // read second operand
      cout << "second operand: ";
      if (! (cin >> y)) {
          /* input error
           *  => error message and exit program with error status
           */
          cerr << "error while reading the second floating value"
               << endl;
          return EXIT_FAILURE;
      }
  
      // print operands and result
      cout << x << " times " << y << " equals " << x * y << endl;
  }
  