new operator in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to allocate memory for an integer using the new operator.

C++

int* ptr = [1] int;

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

Anew

Bmalloc

Calloc

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using malloc instead of new in C++.

Forgetting to use the new operator before the type.

The new operator allocates memory for an integer and returns a pointer to it.

2fill in blank

medium

Complete the code to allocate an array of 5 doubles using the new operator.

C++

double* arr = [1] double[5];

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

Anew

Bmalloc

Ccreate

Dalloc

Attempts:

3 left

💡 Hint

Common Mistakes

Using malloc which is a C function, not recommended in C++.

Forgetting the brackets for array allocation.

The new operator allocates memory for an array of doubles.

3fill in blank

hard

Fix the error in the code to correctly allocate a single float using new.

C++

float* fptr = [1] float();

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

Amalloc

Balloc

Ccreate

Dnew

Attempts:

3 left

💡 Hint

Common Mistakes

Using malloc which returns void* and requires casting.

Using incorrect keywords like create or alloc.

The new operator correctly allocates and initializes a float.

4fill in blank

hard

Fill both blanks to allocate and initialize an array of 3 integers with zeros using new.

C++

int* arr = [1] int[2];

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

Anew

B[3]{}

C()

D{}

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of brackets for arrays.

Forgetting to use new keyword.

The new operator with square brackets allocates an array of integers.

5fill in blank

hard

Fill all three blanks to allocate an array of 4 chars and initialize them to zero using new.

C++

char* buffer = [1] char[2] [3];

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

Anew

B[4]

C()

D{}

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of braces for initialization.

Forgetting to use new or brackets.

The new operator with brackets allocates an array, and braces initialize all elements to zero.