// stack.h: the Stack class definition.

// A Stack of chars.
class Stack {
public:            // interface.  Doesn't require knowing actual implementation
  Stack();                  // constructor (initializer)
  void push (char c);       // push c onto stack.
  char pop(void);           // pop top of stack. Return 0 if already empty.
  int is_empty(void);       // is it empty?
private:
  static const int MAX_SIZE=1000;
  char array[MAX_SIZE];
  int size;
};