Reference vs pointer in C++ - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a reference to an integer variable.

C++

int x = 10;
int& [1] = x;

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

A*p

Br

Cref

Dptr

Attempts:

3 left

💡 Hint

Common Mistakes

Using * instead of & for references.

Naming the reference with invalid characters.

In C++, a reference is declared using the & symbol after the type. Here, r is the reference name.

2fill in blank

medium

Complete the code to declare a pointer to an integer variable.

C++

int x = 20;
int [1] p = &x;

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

A*

B&

Cref

Dptr

Attempts:

3 left

💡 Hint

Common Mistakes

Using & instead of * to declare a pointer.

Confusing pointer declaration with reference declaration.

A pointer is declared using the * symbol before the variable name.

3fill in blank

hard

Fix the error in the code to correctly assign a pointer to an integer variable.

C++

int x = 30;
int* p;
p = [1]x;

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

A*x

Bx

C&x

Dref x

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning the variable directly instead of its address.

Using * operator incorrectly in assignment.

To assign a pointer to the address of a variable, use the & operator before the variable name.

4fill in blank

hard

Fill both blanks to create a reference and a pointer to the same integer variable.

C++

int value = 40;
int& [1] = value;
int* [2] = &value;

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

Aref

Bptr

Cr

Dp

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid variable names.

Mixing up reference and pointer syntax.

Here, r is the reference name and p is the pointer name, both referring to value.

5fill in blank

hard

Fill all three blanks to correctly dereference a pointer and assign its value to a reference.

C++

int num = 50;
int* [1] = #
int& [2] = [3];

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

Ap

Br

C*p

Dnum

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning the pointer variable itself to the reference instead of the dereferenced value.

Using incorrect variable names.

p is the pointer to num, r is the reference assigned to the value pointed by p using *p.