DSA-Quiz1-Pointers

What is the primary purpose of a pointer in C?

• To declare a new data type

• To perform arithmetic operations on numbers

• To store integer values

• To store the memory address of another variable

Which operator is used to get the memory address of a variable?

• . (dot operator)

• & (address-of operator)

• * (dereference operator)

• -> (member access operator)

If `int *ptr;` is declared, what type of value can `ptr` store?

• Address of a floating-point variable

• An integer value

• The memory address of an integer variable

• A floating-point value

What is the output of the following C code snippet?

int x = 10;

int p = &x;

printf("%d", *p);

• The memory address of x

• Error

• Garbage value

• 10

Which of the following statements correctly initializes a pointer `ptr` to point to an integer variable `num`?

• ptr = *num;

• int *ptr = #

• int ptr = num;

• int *ptr = num;

What will be the value of `p` after the following operations and `int` takes 4 bytes?

int arr[] = {10, 20, 30, 40, 50}; int *p = arr; p = p + 2;

• The address of `arr[2]`

• The address of `arr[1]`

• The value `30`

• The address of `arr[0]` + 2 bytes

char str[] = "Hello"; char *ptr = str; What is the value of *(ptr + 2)?

• The memory address of 'l'

• e

• H

• l

Which of the following declarations correctly defines a pointer `ptr` that can point to a `const int` value, meaning the value pointed to cannot be changed through `ptr`, but `ptr` itself can be made to point to a different address?

• const int *ptr;

• const int const *ptr;

• int const *const ptr;

• int *const ptr;

What is the purpose of the `void *` pointer in C?

• It is a null pointer, indicating no valid memory address.

• It is a pointer that points to a memory location that cannot be modified.

• It is a pointer that can only point to functions.

• It is a generic pointer that can hold the address of any data type, but requires typecasting for dereferencing.

What is the correct way to allocate dynamic memory for an array of 10 integers using `malloc` and then free it?

• int arr[10]; free(arr);

• int arr = (int )malloc(10 * sizeof(int)); free(arr);

• int arr = (int )malloc(10); delete arr;

• int *arr = malloc(10); free(arr);