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# C Union MCQ

Q1. The size of a union is determined by the size of the __________
1. First member in the union
2. Last member in the union
3. Biggest member in the union
4. Sum of the sizes of all members

Explanations :none.
Q2. Which member of the union will be active after REF LINE in the following C code?
```      #include
union temp
{
int a;
float b;
char c;
};
union temp s = {1,2.5,’A’}; //REF LINE
```
1. a
2. b
3. c
4. Such declaration are illegal

Explanations :none.
Q3. What would be the size of the following union declaration? (Assuming size of double = 8, size of int = 4, size of char = 1)
```     #include
union uTemp
{
double a;
int b;
char c;
}u;
```
1. 4
2. 8
3. 40
4. 80

Explanations :none.
Q4. What type of data is holded by variable u int in the following C code?
```    #include
union u_tag
{
int ival;
float fval;
char *sval;
} u;
```
1. Will be large enough to hold the largest of the three types;
2. Will be large enough to hold the smallest of the three types;
3. Will be large enough to hold the all of the three types;
4. None of the mentioned

Explanations :none.
Q5. Members of a union are accessed as________________
1. union-name.member
2. union-pointer->member
3. both union-name.member & union-pointer->member
4. none of the mentioned

Explanations :none
Q6. In the following C code, we can access the 1st character of the string sval by using _______
```  #include
struct
{
char *name;
union
{
char *sval;
} u;
} symtab;
```
1. *symtab[i].u.sval
2. symtab[i].u.sval.
3. You cannot have union inside structure
4. Both *symtab[i].u.sval & symtab[i].u.sval.

Explanations :none
Q7. What will be the output of the following C code (Assuming size of int and float is 4)?
```   #include
union
{
int ival;
float fval;
} u;
void main()
{
printf("%d", sizeof(u));
}
```
1. 16
2. 8
3. 8
4. 32

Explanations :none.
Q8. What will be the output of the following C code?
```    #include
union stu
{
int ival;
float fval;
};
void main()
{
union stu r;
r.ival = 5;
printf("%d", r.ival);
}
```
1. 9
2. Compile time error
3. 16
4. 5

Explanations :none.
Q9. What will be the output of the following C code?
```#include
union
{
int x;
char y;
}p;
int main()
{
p.x = 10;
printf("%d\n", sizeof(p));
}
```
1. Compile time error
2. sizeof(int) + sizeof(char)
3. Depends on the compiler
4. sizeof(int)

Explanations :none.
Q10. What will be the output of the following C code?
```#include
union
{
int x;
char y;
}p;
int main()
{
p.y = 60;
printf("%d\n", sizeof(p));
}
}```
1. Compile time error
2. sizeof(int) + sizeof(char)
3. Depends on the compiler
4. sizeof(char)