C malloc() function

C malloc() function - A memory allocator

The malloc() function is used to reserve a block of storage of size bytes. Unlike the calloc() function, malloc() does not initialize all elements to 0.

Syntax malloc() function

void *malloc(size_t size)

Parameters malloc() function

Name Description Required /Optional
size Bytes to allocate. Required

Return value from malloc()

  • Returns a pointer to the reserved space.
  • NULL if not enough storage is available, or if size was specified as zero.

Example: malloc() function

The following example shows the usage of malloc() function.

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

int main () {
   char *str;

   /* Initial memory allocation */
   str = (char *) malloc(10);
   strcpy(str, "w3resource.com");
   printf("String = %s,  Address = %u\n", str, str);

   /* Deallocate allocated memory */


String = w3resource.com,  Address = 1905632

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