fige_08.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.8: figE_08.cpp
// An example of a union.
#include <iostream>
using std::cout;
using std::endl;

// define union Number 
union Number           
{                      
   int integer1;       
   double double1;     
};  // end union Number

int main()
{
   Number value; // union variable

   value.integer1 = 100; // assign 100 to member integer1

   cout << "Put a value in the integer member\n"
        << "and print both members.\nint:   " 
        << value.integer1 << "\ndouble: " << value.double1
        << endl;

   value.double1 = 100.0;  // assign 100.0 to member double1

   cout << "Put a value in the floating member\n" 
        << "and print both members.\nint:   " 
        << value.integer1 << "\ndouble: " << value.double1
        << endl;

   return 0;
}  // end main

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