C Programming Multiple choice Questions and Answers on Sizeof Keyword

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