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

struct int_list_item {
	int number;  // 4 bytes
	struct int_list_item *next;  // 8 bytes
} __attribute__((packed));

void add_number(struct int_list_item *list, int number){
	struct int_list_item *place = list; 
	for(; place->next; place = place->next);
	
	place->next = malloc(sizeof(struct int_list_item)); // I'm not going to write "fourth"
	place->next->number = number;
	place->next->next = 0;
}

int calculate_sum(struct int_list_item*);
int calculate_sum_and_count(struct int_list_item*, int*);

int main(){
	struct int_list_item first;
	first.number = 12;

	struct int_list_item second;
	first.next = &second;
	second.number = 51;
	second.next = 0;

	struct int_list_item *third = malloc(sizeof(struct int_list_item));
	third->number = 67;
	third->next = 0;
	second.next = third;

	third->next = malloc(sizeof(struct int_list_item)); // I'm not going to write "fourth"
	third->next->number = 110;
	third->next->next = 0;

	add_number(&first, 240);
	add_number(&first, 310);
	add_number(&first, 435);

	// Let's print them out!
	for(struct int_list_item *place = &first; place; place = place->next){
		printf("%d (stored at address %p)\n", place->number, &place->number);
		ssize_t dist = (void*)place->next - (void*)place;
		printf("Node distance:  %ld\n", dist);
	}

	int sum_of_list = calculate_sum(&first);
	printf("Sum was:  %d\n", sum_of_list);

//	int sum_again;
	int size_of_list = calculate_sum_and_count(&first, 0);
//	printf("Number of items:  %d (sum is %d)\n", size_of_list, sum_again);
	printf("Number of items:  %d\n", size_of_list);

	for(struct int_list_item *place = third; place;){
		struct int_list_item *tofree = place;
		place = place->next;
		free(tofree);
	}


}