Pointers problems
- 1. The operator used to get value at address stored in a pointer variable is
Options- A. *
- B. &
- C. &&
- D. || Discuss
Correct Answer: *
- 2. In which header file is the NULL macro defined?
Options- A. stdio.h
- B. stddef.h
- C. stdio.h and stddef.h
- D. math.h Discuss
Correct Answer: stdio.h and stddef.h
Explanation:
The macro "NULL" is defined in locale.h, stddef.h, stdio.h, stdlib.h, string.h, time.h, and wchar.h.
- 3. What is (void*)0?
Options- A. Representation of NULL pointer
- B. Representation of void pointer
- C. Error
- D. None of above Discuss
Correct Answer: Representation of NULL pointer
- 4. If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?
Options- A. .
- B. &
- C. *
- D. -> Discuss
Correct Answer: ->
- 5. Can you combine the following two statements into one?
char *p; p = (char*) malloc(100);
Options- A. char p = *malloc(100);
- B. char *p = (char) malloc(100);
- C. char *p = (char*)malloc(100);
- D. char *p = (char *)(malloc*)(100); Discuss
Correct Answer: char *p = (char*)malloc(100);
- 6. A pointer is
Options- A. A keyword used to create variables
- B. A variable that stores address of an instruction
- C. A variable that stores address of other variable
- D. All of the above Discuss
Correct Answer: A variable that stores address of other variable
- 7. How many bytes are occupied by near, far and huge pointers (DOS)?
Options- A. near=2 far=4 huge=4
- B. near=4 far=8 huge=8
- C. near=2 far=4 huge=8
- D. near=4 far=4 huge=8 Discuss
Correct Answer: near=2 far=4 huge=4
Explanation:
near=2,
far=4 and
huge=4 pointers exist only under DOS. Under windows and Linux every pointers is 4 bytes long.
- 8. What would be the equivalent pointer expression for referring the array element a[i][j][k][l]
Options- A. ((((a+i)+j)+k)+l)
- B. *(*(*(*(a+i)+j)+k)+l)
- C. (((a+i)+j)+k+l)
- D. ((a+i)+j+k+l) Discuss
Correct Answer: *(*(*(*(a+i)+j)+k)+l)
- 9. What will be the output of the program?
#include<stdio.h> int main() { char *str; str = "%d\n"; str++; str++; printf(str-2, 300); return 0; }
Options- A. No output
- B. 30
- C. 3
- D. 300 Discuss
Correct Answer: 300
- 10. What will be the output of the program?
#include<stdio.h> int main() { char *str; str = "%s"; printf(str, "K\n"); return 0; }
Options- A. Error
- B. No output
- C. K
- D. %s Discuss
Correct Answer: K
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