free

Syntax

#include <stdlib.h> void free(void *ptr);

Description

Returns the allocated memory to the heap (see section malloc). If the ptr is NULL, free does nothing.

Return Value

None.

Portability

ANSI/ISO C	C89; C99
POSIX	1003.2-1992; 1003.1-2001

Example

char *q = (char *)malloc(20); free(q);