C Pointer MCQs - Multiple Choice Questions with Answers

(1) Given the following code fragment:

	main()
	{
		int row[20],i,sum=0;
		int *p=row;
		for(i=0;i<20;i++)
			*(p+i)=1;
		for(i=0;i<20;i+=sizeof(int))
			sum+=*(p+i);
		printf("sum=%d\n",sum);
	}
	

What will be the result of execution?

[A] sum=10
[B] sum=40
[C] sum=60
[D] sum=190

Comment

Answer: Option [A]
(2) What is the missing statement in the following function which copies string x into string y?

	void strcpy (char *x, char *y)
	{
		while (*y!='\0')
		................./*missing statement*/
		*x='\0';
	}
	

What will be the result of execution?

[A] x=y
[B] *x++=*y++
[C] (*x)++=(*y)++
[D] none of these

Comment

Answer: Option [B]

Pointer variable char *x is pointing to a location and the char *y is assigned to that location. If we assume the missing statement is *x++=*y++ then both the variables point to the next respective location till null ('\0') found.

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(3)

	char *ptr;
	char myString[]="abcdefg";
	ptr=myString
	ptr+=5;
	

The pointer ptr points to which string?

[A] fg
[B] efg
[C] defg
[D] cdefg

Comment

Answer: Option [A]

ptr+=5 means ptr=ptr+5

That means the pointer variable is incremented by 5. Hence it is pointing to the 6th location. i.e. fg

(4) Output of the following program will be

	main()
	{
		int a[]={1,2,9,8,6,3,5,7,8,9};
		int *p=a+1;
		int *q=a+6;
		printf("\n%d",q-p);
	}
	
[A] 9
[B] 5
[C] 2
[D] None of these

Comment

Answer: Option [B]

(5) Given float *pf; int *pi; Which of the following is true?
[A] sizeof(pf) > sizeof(pi)
[B] sizeof(pi) < sizeof(pf)
[C] sizeof(pf) == sizeof(pi)
[D] None of these above

Comment

Answer: Option [C]

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