fig20_09.cpp

来自「《c＋＋大学教程》源码」· C++ 代码 · 共 56 行

// Fig. 20.9: fig20_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

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