stack.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_DATA 100


struct StackElement {
	struct StackElement *head;
	char data[MAX_DATA];
};

struct Stack {
	struct StackElement *head;
};

struct Stack *stack = NULL;

void Stack_push(const char *data)
{
	struct StackElement *el = malloc(sizeof(struct StackElement));
	char *res = strncpy(el->data, data, MAX_DATA);
	el->head = stack->head;
	stack->head = el;
}

struct StackElement *Stack_pop()
{
	struct StackElement *el = stack->head;
	if (stack->head != NULL)
	{
		free(stack->head);
		stack->head = el->head;
		return el;
	}
	else
	{
		return NULL;
	}
}


int main()
{
	stack = malloc(sizeof(struct Stack));
	stack->head = NULL;
	int word_num = 5;
	char *words[] = {"one", "two", "three", "four", "five"};

	for(int i=0; i < word_num; i++)
	{
		Stack_push(words[i]);
	}
	//exit(1);
	struct StackElement *el = malloc(sizeof(struct StackElement));
	while((el = Stack_pop())!=NULL)
	{
		printf("%s\n",el->data);
	}
}