#include <stdlib.h> /* definitions and prototypes for calloc() below */
#include <stdio.h>  /* definitions and prototypes for printf() below */

		/* definition of list item structure */
struct Item_t
{
	double data;
	struct Item_t * next;
};

		/* define type for later convenience usint the item structure */
typedef struct Item_t Item;

static Item *
makeItem( double data )
{
	Item * item = (Item *)calloc( 1, sizeof( Item ) );

	item->data = data;

	return item;
}

int
main()
{
	Item *first = makeItem( 0 ),
	     *prev = first,
	     *item;
	int i;

	for( i = 0; i < 20; i++ )
	{
		item = makeItem( i + 1 );
		prev->next = item;
		prev = item;
	}
	
	for( item = first; item->next != NULL; item = item->next )
	{
		printf( "item data: %f\n", item->data ); 
	}
	return 0;
}