calloc

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Header File

alloc.h, stdlib.h

Category

Memory Routines

Prototype

void *calloc(size_t nitems, size_t size);

Description

Allocates main memory.

calloc provides access to the C memory heap. The heap is available for dynamic allocation of variable-sized blocks of memory. Many data structures, such as trees and lists, naturally employ heap memory allocation.

calloc allocates a block of size nitems * size. The block is initialized to 0.

Return Value

calloc returns a pointer to the newly allocated block. If not enough space exists for the new block or if nitems or size is 0, calloc returns NULL.

Example

  #include <stdio.h>
  #include <alloc.h>
  #include <string.h>
  int main(void)
  {
     char *str = NULL;
     /* allocate memory for string */
     str = (char *) calloc(10, sizeof(char));
     /* copy "Hello" into string */
     strcpy(str, "Hello");
     /* display string */
     printf("String is %s\n", str);
     /* free memory */
     free(str);
     return 0;
  }

Portability

POSIX	Win32	ANSI C	ANSI C++
+	+	+	+