Quiz on C++ Pointers

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Question 1

What is a pointer in C++?

A
A variable that stores a data type
B
A function that points to a variable
C
A variable that stores the memory address of another variable
D
A reference variable

Question 2

Which of the following is the correct syntax to declare a pointer?

A
int ptr;
B
int &ptr;
C
ptr *int;
D
int *ptr;

Question 3

What is the output of the following C++ code?

C++

#include<iostream>
using namespace std;

int main() {
    int var = 5;
    int *ptr = &var;
    cout << *ptr;
    return 0;
}

A
0
B
5
C
Address of var
D
Garbage value

Question 4

How do you dynamically allocate memory for an array in C++ using pointers?

A
int arr[10];
B
int *arr = new int[10];
C
int *arr = malloc(10 * sizeof(int));
D
int *arr = int[10];

Question 5

What does the following C++ code do?

C++

#include<iostream>
using namespace std;

int main() {
    int *ptr = NULL;
    ptr = new int;
    *ptr = 7;
    cout << *ptr;
    delete ptr;
    return 0;
}

A
Outputs 0
B
Outputs 7
C
Causes a compile-time error
D
Causes a segmentation fault

Question 6

What happens if you dereference a NULL pointer in C++?

A
Outputs 0
B
Undefined behavior
C
Causes a compile-time error
D
Outputs NULL

Question 7

How to release the memory allocated by a pointer in C++?

A
delete pointer;
B
free(pointer);
C
release(pointer);
D
remove(pointer);

Question 8

Which operator is used to access the value stored at the address stored in a pointer variable?

A
&
B
->
C
*
D
::

Question 9

What is the correct way to declare a constant pointer to an integer in C++?

A
int const *ptr;
B
const int * const ptr;
C
const int *ptr;
D
int * const ptr;

Question 10

What will be the output of the following C++ code?

C++

#include<iostream>
using namespace std;

void updateValue(int *ptr) {
    *ptr = 20;
}

int main() {
    int var = 10;
    updateValue(&var);
    cout << var;
    return 0;
}

A
10
B
0
C
20
D
Garbage value

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C++

C++ Quiz

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