Question

void free(void *ptr) deallocates the memory previously allocated by a call to _______  ________  or _________

(a) malloc,getenv,abort

(b) calloc,malloc,exit

(c) calloc,malloc,realloc

(d) exit,getenv,abort

This question was posed to me in an interview for internship.

Asked question is from General Utilities in division C Library of C

Answer 1

Correct option is (c) calloc,malloc,realloc

To explain I would say: The free() function causes the space to be deallocated that are pointed to by ptr, that is, made available for further allocation. No action occurs if ptr is a null pointer. Otherwise, if the argument does not match a pointer earlier returned by the calloc. malloc, or realloc function.