free

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Header File

alloc.h, stdlib.h

Prototype

void free(void *block);

Description

Frees allocated block.

free deallocates a memory block allocated by a previous call to calloc, malloc, or realloc.

Return Value

None.

Portability

	POSIX	ANSI C	ANSI C++	Win32	Win64	macOS
free	+	+	+	+

Example

#include <string.h>
#include <stdio.h>
#include <alloc.h>

int main(void) {
    char *str;
    /* allocate memory for string */
    str = (char *) malloc(10);
    /* copy "Hello" to string */
    strcpy(str, "Hello");
    /* display string */
    printf("String is %s\n", str);
    /* free memory */
    free(str);
    return 0;
}