Dynamic Memory

Question 1

malloc parameter(s)

Answer 1

size of block in bytes

Question 2

malloc return type

Answer 2

void pointer to allocated segment

Question 3

calloc parameter(s)

Answer 3

number of items, size of item in bytes

Question 4

calloc return type

Answer 4

void pointer to allocated segment

Question 5

realloc parameter(s)

Answer 5

original pointer, new block size in bytes

Question 6

What happens if memory allocation fails?

Answer 6

NULL pointer is returned

Question 7

Dynamic memory functions are stored in what library?

Answer 7

stdlib.h

Question 8

Types of memory violations

Answer 8

Memory leak, Dangling pointer, Use after free, Double Free, Freeing static memory

Question 9

Not freeing dynamically allocated memory

Answer 9

memory leak

Question 10

Using unallocated pointers

Answer 10

Dangling pointer

Question 11

Using pointers recently freed

Answer 11

Dangling pointer

Question 12

Dereferencing after free

Answer 12

Use after free

Question 13

Freeing the same thing twice

Answer 13

Double free

Question 14

What happens if you dereference NULL?

Answer 14

Segfault

Question 15

What happens if you free NULL?

Answer 15

Nothing

Question 16

int arr[100];
free(arr);

Answer 16

Freeing static memory

Question 17

free(arr);
arr[0] = 1;

Answer 17

Use after free

Question 18

free(arr);
free(arr);

Answer 18

double free

Question 19

Fix for double frees and use after frees

Answer 19

set what you freed to NULL