Pointers Solved MCQs Questions Answers

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1. What is the output of the following code?
int a = 10;
int *p = &a;
cout << *p;
(A) 0
(B) Address of a
(C) 10
(D) Compilation error

2. Which of the following is the correct syntax to declare a pointer to an integer?
(A) int ptr;
(B) int *ptr;
(C) ptr int*;
(D) int& ptr;

3. What will happen if you try to dereference a null pointer?
(A) Runtime error
(B) Compilation error
(C) Prints 0
(D) Prints garbage value

4. What is the output of this code?
int a = 5, b = 10;
int *p = &a;
*p = b;
cout << a;
(A) 5
(B) 10
(C) Compilation error
(D) Garbage value

5. What does the & operator do in pointer context?
(A) Returns the value stored at pointer
(B) Dereferences the pointer
(C) Declares a reference
(D) Returns the address of a variable

6. Which of the following will correctly access the value pointed to by pointer p?
int *p;
(A) &p
(B) *p
(C) p
(D) >p

7. What will the following code print?
int x = 20;
int *p = &x;
*p = *p + 5;
cout << x;
(A) 20
(B) 25
(C) Compilation error
(D) Garbage value

8. Which of the following statements is correct about pointers?
(A) Pointer must point to a variable of same type
(B) Pointer can point to any variable of any type
(C) Pointer stores the value of the variable
(D) Pointer cannot point to another pointer

9. What is the output of this code?
int a = 3, b = 4;
int *p = &a, *q = &b;
*p = *p + *q;
cout << a << " " << b;
(A) 7 4
(B) 3 4
(C) 3 7
(D) Compilation error

10. What happens if you increment a pointer?
(A) Pointer value increases by 1
(B) Compilation error
(C) Pointer points to next memory of same type
(D) Pointer value decreases

11. What is wrong with this code?
int *p;
*p = 5;
(A) Nothing
(B) Dereferencing uninitialized pointer
(C) Syntax error
(D) p should be int

12. How can you declare a pointer to a pointer?
(A) int **ptr;
(B) int ptr2;
(C) int &ptr;
(D) int *ptr2;

13. What is the output of this code?
int arr[] = {1,2,3};
int *p = arr;
cout << *(p+1);
(A) 1
(B) Garbage
(C) 3
(D) 2

14. Which statement is correct?
(A) Pointer arithmetic depends on size of type
(B) Pointer arithmetic is always +1
(C) Pointers cannot be compared
(D) Pointer arithmetic is undefined

15. What is the output?
int a = 10;
int *p = &a;
cout << p;
(A) 10
(B) Address of a
(C) Compilation error
(D) Null

16. What will this code output?
int x = 5;
int *p = &x;
int **q = &p;
**q = 15;
cout << x;
(A) 5
(B) Garbage
(C) Compilation error
(D) 15

17. Which is the correct way to allocate memory dynamically for an integer?
(A) int *p = new int;
(B) int p = new int;
(C) int p = int*;
(D) int *p = malloc(sizeof(int));

18. What is wrong in this code?
int *p = NULL;
cout << *p;
(A) Nothing
(B) Dereferencing null pointer
(C) Syntax error
(D) Pointer should be int

19. Output of this code?
int a = 3;
int *p = &a;
int *q = p;
*q = 7;
cout << a;
(A) 7
(B) 3
(C) Compilation error
(D) Garbage

20. Which statement is true about pointers and arrays?
(A) Array name is a constant pointer
(B) Arrays cannot be accessed using pointers
(C) Pointer cannot point to array element
(D) Array name stores the value of first element

Data Structures MCQs

Basic Concepts

Introduction to Data Structures
- Abstract Data Types (ADT) MCQs
Complexity Analysis MCQs

Linear Data Structures MCQs

Arrays MCQs
Linked Lists MCQs
Stacks MCQs
- Stack operations (push, pop, peek) MCQs
- Applications of stacks (expression evaluation, recursion) MCQs
Queues MCQs
- Queue operations (enqueue, dequeue, front, rear) MCQs
- Types: Simple queue, circular queue, priority queue, deque MCQs

Non-Linear Data Structures MCQs

Trees MCQs
Heaps MCQs
Graphs MCQs

Hashing MCQs MCQs

Hash Tables

Sorting and Searching Algorithms MCQs

Sorting Algorithms MCQs
Searching Algorithms MCQs

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Memory Management in data structures MCQs
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String Manipulation Algorithms MCQs
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