TECHNOHACKER: C Programming

General Questions;

What is (void*)0?

A.	Representation of NULL pointer
B.	Representation of void pointer
C.	Error
D.	None of above

Answer & Explanation

Answer: Option A
Explanation:
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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 & Explanation

Answer: Option C
Explanation:
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In which header file is the NULL macro defined?

A.	stdio.h	B.	stddef.h
C.	stdio.h and stddef.h	D.	math.h

Answer & Explanation

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.

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 & Explanation

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.

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 & Explanation

Answer: Option D
Explanation:
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What would be the equivalent pointer expression for referring the array element a[i][j][k][l]

A.	((((a+i)+j)+k)+l)	B.	((((a+i)+j)+k)+l)
C.	(((a+i)+j)+k+l)	D.	((a+i)+j+k+l)

Answer & Explanation

Answer: Option B
Explanation:
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A pointer is

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