#include <stdlib.h>

#include "stack.h"
#include "node.h"


Stack* createStack(){
	Stack* s = (Stack*) malloc(sizeof(Stack));
	s->top = NULL;
	s->size = 0;
	return s;
}

void push(Stack* stack, int item){
  Node* node = (Node*) malloc( sizeof(Node) );
  node->data = item;
  node->next = stack->top;
  stack->top = node;
  stack->size += 1;
}

int  pop(Stack* stack){
  Node* node = stack->top;
  stack->top = node->next;
  stack->size -= 1;
  return node->data;
}

int  peek(Stack* stack){
  return stack->top->data;
}

int  size(Stack* stack){
  return stack->size;
}