enum with_tag {int_tag, char_tag};



struct with_tag{

enum with_tag tag;

union {

int i;

char c;

} twoUnion;

} sampleStruct;



So, when assigning new int values:



sampleStruct.tag = int_tag;

sampleStruct.twoUnion.i = 3;



when assigning new char vaules:



sampleStruct.tag = char_tag;

sampleStruct.twoUnion.c = 'C';



So, later, you can know what kind of data is assigned to union by checking tag's vaule.

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