#ifndef ENUM_H
#define ENUM_H

using namespace std;
#include <iostream>

enum retval { FAIL, OK };
enum boolean { FALSE, TRUE };

#endif

#ifndef STRUCT_STACK_H
#define STRUCT_STACK_H

struct nodo{
  int val;
  nodo *next;
};

typedef nodo * stack ;

void init(stack & );
retval push (int, stack &);
retval top (int &, stack );
retval pop (stack &);
void print(stack);
void print_reverse(stack);



#endif