struct AStructure
{
   char First;
   char Second;
   char Third;
   char Forth;
};

union TheData
{
   char Name[4];
   struct AStructure Letters;
}VarName;
 
main()
{
   VarName.Letters.First = 'R';
   VarName.Letters.Second = 'o';
   VarName.Letters.Third = 'y';
   VarName.Letters.Forth = '\0';
   printf("My name is %s\n",VarName.Name);
}