Memory leak concepts - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to allocate memory for an integer pointer.

C

int *ptr = (int *)[1](sizeof(int));

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

Amalloc

Bfree

Cprintf

Dsizeof

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'free' instead of 'malloc' to allocate memory.

Using 'sizeof' as a function to allocate memory.

The malloc function allocates memory dynamically. Here, it allocates enough space for one integer.

2fill in blank

medium

Complete the code to release the allocated memory.

C

free([1]);

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

Amalloc

Bptr

Csizeof

DNULL

Attempts:

3 left

💡 Hint

Common Mistakes

Passing 'malloc' or 'sizeof' instead of the pointer.

Not freeing allocated memory causing leaks.

The free function releases the memory previously allocated by malloc. You must pass the pointer to the allocated memory.

3fill in blank

hard

Fix the error in the code to avoid memory leak by freeing the allocated memory.

C

int *arr = (int *)malloc(5 * sizeof(int));
// Missing [1] here
return 0;

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

Afree(arr);

Bmalloc(arr);

Csizeof(arr);

Darr = NULL;

Attempts:

3 left

💡 Hint

Common Mistakes

Not calling free causing memory leaks.

Calling malloc instead of free to release memory.

To avoid memory leaks, you must call free on the allocated pointer before the program ends or when the memory is no longer needed.

4fill in blank

hard

Fill both blanks to correctly allocate and free memory for a character array.

C

char *buffer = (char *)[1](100 * sizeof(char));
// Use the buffer
[2](buffer);

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

Amalloc

Bfree

Csizeof

Dprintf

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'sizeof' or 'printf' instead of 'malloc' or 'free'.

Forgetting to free allocated memory.

First, allocate memory with malloc. After using the buffer, release the memory with free to avoid leaks.

5fill in blank

hard

Fill all three blanks to create a memory leak by allocating memory without freeing it.

C

int *data = (int *)[1](10 * [2](int));
// Forgot to [3] data, causing a memory leak.

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

Amalloc

Bsizeof

Cfree

Dprintf

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to free allocated memory.

Using wrong functions for allocation or size.

The code allocates memory with malloc and uses sizeof to get the size of int. The comment correctly identifies that it forgot to call free(data), causing a memory leak.