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

struct Node {
	int key;
	struct Node * next;
};

struct Node * pushFront(int key, struct Node * oldListStart)
{
	struct Node * newNode;
	newNode = (struct Node *)malloc(sizeof(struct Node));
	newNode->key = key;
	newNode->next = oldListStart;
	return newNode;
}

int popFront(struct Node ** pListStart)
{
	struct Node * newListStart;
	int returnKey = (*pListStart)->key;
	newListStart = (*pListStart)->next;
	free(*pListStart);
	*pListStart = newListStart;
	return returnKey;
}

//print list front-to-back
void printList(struct Node * currentNode)
{
	while(currentNode) {
		printf("%i ", currentNode->key);
		currentNode = currentNode->next;
	}
}

int main(int argc, char **argv)
{
	struct Node * listStart = NULL;
	int tmp = 5;
	listStart = pushFront(89, listStart);
	
	while(tmp--)
		listStart = pushFront(tmp, listStart);
	
	tmp = popFront(&listStart);
	printf("popvalue : %i \n", tmp);
	printList(listStart);
	printf("hello world\n");
	return 0;
}