Pointer declaration in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a pointer to an integer named ptr.

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 * for pointer declaration.

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 declare a pointer to a double named ptrDouble.

C++

double [1] ptrDouble;

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

A*

B&

C^

D!

Attempts:

3 left

💡 Hint

Common Mistakes

Using & which is for address-of operator, not declaration.

Using symbols like ^ or ! which are invalid here.

The asterisk (*) is used to declare a pointer variable, here for a double type.

3fill in blank

hard

Fix the error in the pointer declaration for an integer pointer named p.

C++

int [1] p;

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

A++

B*

C&&

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using & which is the address-of operator, not declaration.

Using && which is invalid syntax here.

The correct symbol to declare a pointer is the asterisk (*). Using & or other symbols causes errors.

4fill in blank

hard

Fill both blanks to declare a pointer to a character named ptrChar and initialize it to nullptr.

C++

char [1] ptrChar = [2];

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

A*

Bnullptr

CNULL

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using & instead of * for pointer declaration.

Initializing pointer with NULL instead of nullptr.

The asterisk (*) declares the pointer, and nullptr initializes it to point to nothing safely.

5fill in blank

hard

Fill all three blanks to declare a pointer to a float named ptrFloat, initialize it to nullptr, and then assign it the address of variable val.

C++

float [1] ptrFloat = [2];
float val = 3.14f;
ptrFloat = [3] val;

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

A*

Bnullptr

C&

Dval

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning pointer directly to val instead of its address.

Using NULL instead of nullptr for initialization.

The asterisk (*) declares the pointer, nullptr initializes it safely, and & gets the address of val to assign to the pointer.