The u.n.i.o.n data type

endl · **Joined:** Sat Nov 11, 2006 1:15 pm **Posts:** 280

Compiler: Visual C++ Express Edition 2005
Compiled on Platform: Windows XP Pro SP2
Header file: Standard
Additional library: none/default
Additional project setting: Set project to be compiled as C++
Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)
Other info: none
To do: Displaying some values
To show: The u.n.i.o.n data type

Code:

// The union data type
#include <iostream>
using namespace std;

union Num
{
   int      ValueI;
   float    ValueF;
   double   ValueD;
   char   ValueC;
};

void main()
{
   // Optional union keyword
   // ValueI = 100
   Num TestVal = {100};

   cout<<"\nInteger = "<<TestVal.ValueI<<endl;
   TestVal.ValueF = 2.123L;
   cout<<"Float = "<<TestVal.ValueF<<endl;
   cout<<"Uninitialzed double = "<<TestVal.ValueD<<endl;
   cout<<"Some rubbish???"<<endl;
   TestVal.ValueC = 'U';
   cout<<"Character = "<<TestVal.ValueC<<endl;
}

Output:

Code:

Integer = 100
Float = 2.123
Uninitialzed double = 5.30754e-315
Some rubbish???
Character = U
Press any key to continue . . .

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The u.n.i.o.n data type

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