#include <iostream>
#include <cstdio>
using namespace std;

#define MAXSIZE 100

typedef int Status;
typedef int Elem;

typedef struct sqStack
{
  int len;
  Elem *base;
  Elem *top;
}sqStack;

Status InitStack(sqStack &s)
{
  s.base = new Elem[MAXSIZE];
  if (!s.base) return 0;

  s.top = s.base;
  s.len = MAXSIZE;

  return 1;
}

Status Push(sqStack &s,Elem e)
{
  if (s.top - s.base == s.len) return 0; //满
  else *s.top++ = e;

  return 1;
}

Status Pop(sqStack &s, Elem &e)
{
  if (s.top == s.base) return 0; //空
  else e = *--s.top;

  return 1;
}

Status GetTop(sqStack &s)
{
  if (s.top != s.base) 
    return *(s.top - 1); //满意的写法 *了

  else return 0;
}

int main()
{
  sqStack s;
  //1
  InitStack(s);

  //1
  Push(s,1);
  
  //1
  cout << GetTop(s);

  //1
  Elem e;
  Pop(s, e);

  cout << e;
}