fige_09.cpp

是有关C++编程原理教程的例子程序,全,应该对大家有所帮助

// Fig. E.9: figE_09.cpp
// Using an anonymous union.
#include <iostream>
using std::cout;
using std::endl;

int main()
{
   // declare an anonymous union                                
   // members integer1, double1 and charPtr share the same space
   union                                                        
   {                                                            
      int integer1;                                             
      double double1;                                           
      char *charPtr;                                            
   };  // end anonymous union                                   

   // declare local variables
   int integer2 = 1;
   double double2 = 3.3;
   char *char2Ptr = "Anonymous";

   // assign value to each union member
   // successively and print each
   cout << integer2 << ' ';
   integer1 = 2;
   cout << integer1 << endl;

   cout << double2 << ' ';
   double1 = 4.4;
   cout << double1 << endl;

   cout << char2Ptr << ' ';
   charPtr = "union";
   cout << charPtr << endl;

   return 0;
}  // end main

/**************************************************************************
 * (C) Copyright 1992-2005 by Deitel & Associates, Inc. and               *
 * Pearson Education, Inc. All Rights Reserved.                           *
 *                                                                        *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 **************************************************************************/