C AND C++ PROGRAMMING QUESTIONS ON POINTERS

HERE AM POSTING C AND C++  PROGRAMMING QUESTIONS
THIS HAVE BEEN ASKED IN MANY PLACEMENT PAPERS AND IN COMPETATIVE EXAMS.
IF U WANT ANY THIN ELSE PLS DO ASK IN REQUEST PAGE.

1.	What is (void*)0?
	A. Representation of NULL pointer B. Representation of void pointer C. Error D. None of above

Answer: Option A

2.	Can you combine the following two statements into one? char *p; p = (char*) malloc(100);
	A. char p = *malloc(100); B. char *p = (char) malloc(100); C. char *p = (char*)malloc(100); D. char *p = (char *)(malloc*)(100);

Answer: Option C

3.	In which header file is the NULL macro defined?
	A. stdio.h B. stddef.h C. stdio.h and stddef.h D. stdlib.h

Answer: Option C
Explanation:
The macro "NULL" is defined in locale.h, stddef.h, stdio.h, stdlib.h, string.h, time.h, and wchar.h.

4.	How many bytes are occupied by near, far and huge pointers (DOS)?
	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

Answer: Option A
Explanation:
near=2, far=4 and huge=4 pointers exist only under DOS. Under windows and Linux every pointers is 4 bytes long.

5.	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?
	A. . B. & C. * D. ->

Answer: Option D
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