#ifndef stack_h
#define stack_h

#define MAX 50

struct Stack {
  int top;
  int elems[MAX];

  void push(int i) { elems[top++]=i; }
  int  pop(void)   { return elems[--top]; }
  int  empty(void) { return top == 0; }
};

struct Stack* createStack(void);

#endif