What is the problem with following code?
(A) Compiler Error: free can’t be applied on NULL pointer
(B) Memory Leak
(C) Dangling Pointer
(D) The program may crash as free() is called for NULL pointer.
Explanation: free() can be called for NULL pointer, so no problem with free function call.
The problem is memory leak, p is allocated some memory which is not freed, but the pointer is assigned as NULL. The correct sequence should be following:
free(p); p = NULL;