Linux C library functions Encyclopedia: Memory Control functions

1.calloc (Configure memory space)

Related functions:

Malloc,free,realloc,brk

Table header file:

#include <stdlib.h>

To define a function:

void *calloc (size_t nmemb,size_t size);

Function Description:

Calloc () is used to configure the NMEMB contiguous unit of memory, each unit of size, and returns a pointer to the first element. This works the same way as in the following ways: malloc (nmemb*size), but the memory content is initialized to 0 when the calloc () is used to configure memory.

return value:

If the configuration succeeds, a pointer is returned and NULL is returned if it fails.

Example one:

#include <stdio.h> 
#include <stdlib.h> 
int main (void) 
    { 
        int i; 
        int *pn= (int *) calloc (10,sizeof (int)); 
        for (i=0;i<10;i++) 
        printf ("%3d", *pn++); 
        printf ("\ n"); 
        Free (PN); 
        return 0; 
    }

Case TWO:

#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
int main (void)  
{  
    char *str = NULL;  
/* Allocate memory space/
   char  *str = (char*) calloc (sizeof (char));  
/* Write Hello to * *
    strcpy (str, "Hello");  
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/* Display variable content
    /printf ("String is%s\n", str);  
/* Free Space * *
    (str);  
    return 0;  
}