C Programming Multiple Choice Questions and Answers on Sizeof Keyword for Freshers

1. What is the sizeof(char) in a 32-bit C compiler?

a) 1 bit
b) 2 bits
c) 1 Byte
d) 2 Bytes

Answer: c

2. What is the output of this C code?

1.     #include 

2.     printf("%d", sizeof('a'));

a) 1
b) 2
c) 4
d) None of the mentioned

Answer: c

3. Size of an array can be evaluated by:
    (Assuming array declaration int a[10];)

a) sizeof(a);
b) sizeof(*a);
c) sizeof(a[10]);
d) 10 * sizeof(a);

Answer: a

4. What is the output of this C code?

1.     #include 

2.     union temp

3.     {

4.         char a;

5.         char b;

6.         int c;

7.     }t;

8.     int main()

9.     {

10.         printf("%d", sizeof(t));

11.         return 0;

12.     }

a) 1
b) 2
c) 4
d) 6

Answer: c

5. Which of the following is not an operator in C?

a) ,
b) sizeof()
c) ~
d) None of the mentioned

Answer: d

6. Which among the following has the highest precedence?

a) &
b) <<
c) sizeof()
d) &&

Answer: c

7. The sizeof(void) in a 32-bit C is_____

a) 0
b) 1
c) 2
d) 4

Answer: b

8. What type of value does sizeof return?

a) char
b) short
c) unsigned int
d) long

Answer: c

9. Which among the following is never possible in C when members are different in a structure and union?
    //Let P be a structure
    //Let Q be a union

a) sizeof(P) is greater than sizeof(Q)
b) sizeof(P) is less than sizeof(Q)
c) sizeof(P) is equal to sizeof(Q)
d) none of the mentioned

Answer: d

10. Which among the following is never possible in C when members in a structure are same as that in a union?
    //Let P be a structure
    //Let Q be a union

a) sizeof(P) is greater than sizeof(Q)
b) sizeof(P) is equal to sizeof(Q)
c) sizeof(P) is less than to sizeof(Q)
d) none of the mentioned

Answer: c

11. What will be the size of the following structure?

1.     #include 

2.     struct temp

3.     {

4.         int a[10];

5.         char p;

6.     };

a) 5
b) 11
c) 41
d) 44

Answer: d

12. Comment on the output of following C program?

1.     #include 

2.     main()

3.     {

4.         int a = 1;

5.         printf("size of a is %d, ", sizeof(++a));

6.         printf("value of a is %d", a);

7.     };

a) size of a is 4, value of a is 1
b) size of a is 4, value of a is 2
c) size of a is 2, value of a is 2
d) size of a is 2, value of a is 2

Answer: a

13. Which among the following is right?

a) sizeof(struct stemp*) > sizeof(union utemp*) > sizeof(char *)
b) sizeof(struct stemp*) < sizeof(union utemp*) < sizeof(char *)
c) sizeof(struct stemp*) = sizeof(union utemp*) = sizeof(char *)
d) the order Depends on the compiler

Answer: c

14. Comment on the following C code?

1.     #include 

2.     printf("%d", sizeof(strlen("HELLOWORLD")));

a) Output, 4
b) Output, 10
c) Output, 16
d) Error, sizeof cannot evaluate size of a function.

Answer: a

15. Which of the following cannot be used inside sizeof?

a) pointers
b) functions
c) macro definition
d) none of the mentioned

Answer: d

16. Comment on the following C code?

1.     #include 

2.     (sizeof double = 8, float = 4, void = 1)

3.     #define PI 3.14

4.     int main()

5.     {

6.         printf("%d", sizeof(PI));

7.     }

a) Output is 8
b) Output is 4
c) Output is 1
d) Error, we can’t use sizeof on macro-definitions

Answer: a