Why pointers are needed in C - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a pointer to an integer.

C

int [1] ptr;

Drag options to blanks, or click blank then click option'

A#

B&

C*

D%

Attempts:

3 left

💡 Hint

Common Mistakes

Using & instead of * to declare a pointer.

Forgetting the * symbol when declaring a pointer.

The asterisk (*) is used to declare a pointer variable in C.

2fill in blank

medium

Complete the code to assign the address of variable 'a' to pointer 'ptr'.

C

int a = 10;
int *ptr;
ptr = [1]a;

Drag options to blanks, or click blank then click option'

A%

B*

C#

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using * instead of & to get the address.

Assigning the variable value instead of its address.

The ampersand (&) operator gives the address of a variable in C.

3fill in blank

hard

Fix the error in the code to correctly print the value pointed by 'ptr'.

C

int a = 5;
int *ptr = &a;
printf("%d", [1]);

Drag options to blanks, or click blank then click option'

A*ptr

Bptr

C&ptr

D&&ptr

Attempts:

3 left

💡 Hint

Common Mistakes

Printing the pointer address instead of the value.

Using &ptr which gives the address of the pointer itself.

Using *ptr accesses the value stored at the address the pointer points to.

4fill in blank

hard

Fill both blanks to create a pointer to an integer and assign it the address of variable 'num'.

C

int num = 20;
[1] ptr;
ptr = [2]num;

Drag options to blanks, or click blank then click option'

Aint *

Bint

C&

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Declaring pointer without *.

Assigning value instead of address.

To declare a pointer to int, use 'int *'. To assign address, use '&'.

5fill in blank

hard

Fill all three blanks to create a pointer, assign it the address of 'val', and print the value using the pointer.

C

int val = 30;
[1] ptr;
ptr = [2]val;
printf("%d", [3]ptr);

Drag options to blanks, or click blank then click option'

Aint *

B&

C*

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting * in declaration.

Assigning value instead of address.

Printing pointer address instead of value.

Declare pointer with 'int *', assign address with '&', and dereference with '*'.