delete operator in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to correctly delete the dynamically allocated integer.

C++

#include <iostream>
int main() {
    int* ptr = new int(10);
    [1] ptr;
    return 0;
}

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

Afree

Bdispose

Cremove

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using free() instead of delete for memory allocated with new.

Trying to use remove or dispose which are not C++ operators.

The delete operator is used to free memory allocated with new in C++.

2fill in blank

medium

Complete the code to delete a dynamically allocated array.

C++

#include <iostream>
int main() {
    int* arr = new int[5];
    [1] arr;
    return 0;
}

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

Adelete[]

Bfree

Cdelete

Ddispose

Attempts:

3 left

💡 Hint

Common Mistakes

Using delete instead of delete[] for arrays.

Using free() which is for C-style allocation.

When deleting arrays allocated with new[], use delete[] to properly free all elements.

3fill in blank

hard

Fix the error in the code by choosing the correct delete syntax.

C++

#include <iostream>
int main() {
    double* data = new double(3.14);
    [1] data;
    return 0;
}

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

Afree

Bdelete()

Cdelete

Ddelete[]

Attempts:

3 left

💡 Hint

Common Mistakes

Using delete[] on a single object.

Trying to call delete as a function like delete().

Since data points to a single double, use delete without brackets.

4fill in blank

hard

Fill both blanks to correctly delete a dynamically allocated array and avoid memory leaks.

C++

#include <iostream>
int main() {
    char* letters = new char[10];
    [1] [2];
    return 0;
}

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

Adelete[]

Bdelete

Cletters

Dfree

Attempts:

3 left

💡 Hint

Common Mistakes

Using delete instead of delete[] for arrays.

Forgetting to specify the pointer after delete.

Use delete[] followed by the pointer variable to free the array memory.

5fill in blank

hard

Fill all three blanks to correctly delete a dynamically allocated object and set the pointer to nullptr.

C++

#include <iostream>
int main() {
    float* value = new float(5.5f);
    [1] [2];
    [3] = nullptr;
    return 0;
}

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

Adelete

Bvalue

Dptr

Attempts:

3 left

💡 Hint

Common Mistakes

Not setting the pointer to nullptr after deletion.

Using wrong pointer variable names.

Delete the object with delete, then set the pointer value to nullptr to avoid dangling pointers.