An example of a union : union « Data Types « C++ Tutorial

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C++ Tutorial » Data Types » union

2.35.1.An example of a union

#include <iostream>

using std::cout;

using std::endl;



union Number           

{                      

   int integer1;       

   double double1;     

};



int main()

{

   Number value;



   value.integer1 = 100;



   cout << value.integer1 << "\ndouble: " << value.double1

        << endl;



   value.double1 = 100.0;



   cout << value.integer1 << "\ndouble: " << value.double1

        << endl;



   return 0;

}

100
double: 4.24399e-314
0
double: 100

2.35.union
	2.35.1.	An example of a union
	2.35.2.	Put int and float into a union
	2.35.3.	A union with method
	2.35.4.	An anonymous union.
	2.35.5.	A union is created with several data types.
	2.35.6.	Using an anonymous union: members integer1, double1 and charPtr share the same space
	2.35.7.	Unions and Classes Are Related

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