INTERVIEW QUESTIONS PROGRAMMING LANGUAGES C DETAILS

Question: union u1
{
int i;
char c;
}u2;
u2.i=32767;
u2.c='a';
now the i value gets replaced.
If we want to know the data that is saved in the union..internally, without knowing what values that we are using in the prog.

that is if just want to know whether a union currently holds an int or a char? If it is a combination of both int and char..we must know even that. and the memory locations at which this data is stored?

Answer: 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.

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.
Source: CoolInterview.com

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