fig18_09.cpp

这是C＋＋编程经典的书上实例的源代码。 （英文名是《C＋＋ how to program》第3版）

// Fig. 18.9: fig18_09.cpp
// Using an anonymous union
#include <iostream>

using std::cout;
using std::endl;

int main()
{
   // Declare an anonymous union.
   // Note that members b, d, and fPtr share the same space.
   union {
      int b;
      double d;
      char *fPtr;
   };

   // Declare conventional local variables
   int a = 1;
   double c = 3.3;
   char *ePtr = "Anonymous";

   // Assign a value to each union member 
   // successively and print each.
   cout << a << ' ';
   b = 2;
   cout << b << endl;

   cout << c << ' ';
   d = 4.4;
   cout << d << endl;

   cout << ePtr << ' ';
   fPtr = "union";
   cout << fPtr << endl;

   return 0;
}




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