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C | Dynamic Memory Allocation | Question 1

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  • Difficulty Level : Easy
  • Last Updated : 28 Jun, 2021
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The most appropriate matching for the following pairs (GATE CS 2000)

X: m=malloc(5); m= NULL;        1: using dangling pointers
Y: free(n); n->value=5;         2: using uninitialized pointers
Z: char *p; *p = ’a’;           3. lost memory is:

(A) X—1 Y—3 Z-2
(B) (X—2 Y—1 Z-3
(C) X—3 Y—2 Z-1

(D) X—3 Y—1 Z-2

Answer: (D)

Explanation: X -> A pointer is assigned to NULL without freeing memory so a clear example of memory leak
Y -> Trying to retrieve value after freeing it so dangling pointer.
Z -> Using uninitialized pointers

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