Void Pointers MCQ: Void Pointers Multiple Choice Questions

Void Pointers MCQ with answers and explanations for placement tests and job interviews. These solved Void Pointers MCQ questions are useful for the campus placement for all freshers including Engineering Students, MCA students, Computer and IT Engineers, etc.

Our Void Pointers MCQ ( Void Pointers Multiple Choice Questions and Answer ) focuses on all areas of R Language Programming. We will also regularly update the Void Pointers MCQs and the most interesting thing is that questions come in a random sequence. So every time you will feel new questions.

We have already published a blog post on void pointers. If you want you can also see this blog post. It would help you in your preparation. “Introduction of void pointers with its application“.

Guideline of Void Pointers MCQ:

This MCQ on Void Pointers is intended for checking your Void Pointers knowledge and understanding. It takes 40 minutes to pass the Void Pointer MCQ. If you don’t finish the MCQ on Void Pointers within the mentioned time, all the unanswered questions will count as wrong. You can miss the questions by clicking the “Next” button and return to the previous questions by the “Previous” button. Every unanswered question will count as wrong. MCQ on Void Pointer has features of randomization which feel you a new question set at every attempt.

In these Void Pointer MCQs, we have also implemented a feature that not allowed the user to see the next question or finish the quiz without attempting the current void pointer MCQ.

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Void Pointer MCQ

Void Pointer MCQ: Void Pointer Multiple Choice Questions and Answers

1 / 21

#include<stdlib.h> #include <stdio.h> int main() { int x = 4; float y = 5.5; //A void pointer void *ptr; ptr = &x; printf("Integer variable is = %d", *( (int*) ptr) ); ptr = &y; printf("\nFloat variable is= %f", *( (float*) ptr) ); return 0; }

Compiler Error

4 , 5.5

4 , 5

None of the above

2 / 21

What we can’t do on a void pointer?

pointer functions

pointer arithmetic

pointer objects

pointer functions & objects

3 / 21

Consider the following C code

#include <stdio.h> int main() { int a = 300; char *b = (char *)&a; *++b = 2; printf("%d ",a); return 0; }

Consider the size of int is two bytes and size of char as one byte. Predict the output of the following code. Assume that the machine is a little-endian.

Compiler Error

300

556

Runtime error

The binary equivalent of 300 is 00000001 00101100. Since the machine is little endian, 00000001 00101100 is stored as 00101100 00000001 in the memory in the form of an array. Pointer b is then given the address of a. It means that the address of first byte of 00101100 00000001 is allotted to b (hence b is allotted 00101100). *++b = 2 increments the value of b by 1 so that b now points to the next memory address which is 00000001 and the binary equivalent of 2 (00000010) will be stored here. Finally, a becomes 00101100 00000010, which in decimal is basically 556

4 / 21

The reason for using pointers in a C program is?

Pointers allow different functions to share and modify their local variables.

To pass large structures so that complete copy of the structure can be avoided.

Pointers enable complex “linked" data structures like linked lists and binary trees.

All of these

None of the above

5 / 21

Pick the best statement for the following program snippet:

#include <stdio.h> int main() { //Suppose address of var is 2000 int var; void *ptr = &var; *ptr = 5; printf("var=%d and *ptr=%d",var,*ptr); return 0; }

It will print “var=5 and *ptr=2000”

Compile error

It will print “var=5 and *ptr=XYZ” where XYZ is some random address

It will print “var=5 and *ptr=5”

6 / 21

What is the output?

#include<stdio.h> int main() { int a = 10; void *ptr = &a; printf("%d", *ptr); return 0; }

10

Garbage

Compiler Error

None of the above

7 / 21

When does the void pointer can be dereferenced?

When it doesn’t point to any value

When it cast to another type of object

Using delete keyword

Using shift keyword

8 / 21

The operator used for dereferencing or indirection is ____

&

*

->

.

9 / 21

The void pointer can point to which type of object?

int

float

char

All of the above

10 / 21

Suppose that in a C program snippet, the following statements are used.

i) sizeof(int); ii) sizeof(int*); iii) sizeof(void*);

Assuming the size of the pointer is 4 bytes and the size of the int is also 4 bytes, pick the most correct answer from the given options.

Only i) would compile successfully and it would return size as 4.

i), ii) and iii) would compile successfully but the size of each would be different and would be decided at run time.

i), ii) and iii) would compile successfully and size of each would be same i.e. 4

ii) and iii) would result in compile error but i) would compile and result in size as 4.

11 / 21

int main() { void *pVoid; pVoid = (void*)0; printf("%lu",sizeof(pVoid)); return 0; }

Pick the best statement for the above C program snippet.

Assigning (void *)0 to pVoid isn’t correct because memory hasn’t been allocated. That’s why no compile error but it'll result in run time error.

Assigning (void *)0 to pVoid isn’t correct because a hard coded value (here zero i.e. 0) can’t assigned to any pointer. That’s why it'll result in compile error.

No compiler issue and no run time issue. And the size of the void pointer i.e. pVoid would be machine dependent like other pointer.

sizeof() operator isn’t defined for a pointer of void type.

12 / 21

In the below statement, ptr1 and ptr2 are uninitialized pointers to int i.e. they are pointing to some random address that may or may not be valid address. int* ptr1, ptr2;

True

False

Even though * is placed closer to int, * would be associated to ptr1 only but not to ptr2. It means that “int* ptr1” is equal to “int *ptr1”. That’s why only ptr1 is uninitialized pointer to int. Basically, though both ptr1 and ptr2 are uninitialized variables yet ptr1 is pointer to int while ptr2 is variable of type int. If we really want to make both variables as pointers, we need to mention them as “int *ptr1, *ptr2;”

Even though * is placed closer to int, * would be associated to ptr1 only but not to ptr2. It means that “int* ptr1” is equal to “int *ptr1”. That’s why only ptr1 is uninitialized pointer to int. Basically, though both ptr1 and ptr2 are uninitialized variables yet ptr1 is pointer to int while ptr2 is variable of type int. If we really want to make both variables as pointers, we need to mention them as “int *ptr1, *ptr2;”

13 / 21

What does the following statement mean?

//Declaration int (*fptr)(void *);

pointer to function taking a void * argument and returns an int

pointer to a pointer

function taking a void * argument and returning a pointer to int

None of the above

14 / 21

What is the output?

#include<stdio.h> int main() { int a; char *x; x = (char *)&a; a = 664; x[0] = 1; x[1] = 2; printf("%d\n",a); return 0; }

66

664

12

Machine dependent

15 / 21

What is the output?

#include<stdio.h> int main() { int a = 12; void *ptr = (int *)&a; printf("%d", *ptr); return 0; }

12

Compiler Error

0

Runt Time Error

16 / 21

What is the output?

#include<stdio.h> int main() { int a = 10; void *ptr = &a; printf("%d", *(int *)ptr); return 0; }

10

Garbage value

Compiler error

None of the above

17 / 21

Generic pointers can be declared with__________ .

auto

void

asm

None of the above

18 / 21

‘ptrdata’ is a pointer to a data type. The expression *ptrdata++ is evaluated as (in C++) :

(*ptrdata)++

*(ptrdata)++

*(ptrdata++)

Depends on compiler

19 / 21

What is the output?

#include <stdio.h> int main() { void *pvData = NULL; printf("%d\n\n",sizeof(pvData)); return 0; }

1

2

4

Depending on the platform

None of the above

20 / 21

What is the size of the void pointer in C?

0

1

2

Similar to the size of the character pointer.

None of the above

21 / 21

What is the output?

#include<stdio.h> int main() { char *ptr = "Aticleworld"; printf("%c\n", *&*&*ptr); return 0; }

Compiler Error

Garbage Value

Runtime Error

A

None of the above

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Void Pointers MCQ: Void Pointers Multiple Choice Questions

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