// str.h - header file for str class

#include <iostream>

class str {

private:
  char *array;
  int len, max;

public:
  str(int n = 10);               // void and size ctor
  str(const str &s);             // copy ctor
  str(const char *s);            // promotion ctor
  ~str();                        // dtor
  str& operator=(const str &s);  // assignment operator
  char& operator[](int n);       // index operator
  char operator[](int n) const;  // index operator for const str
  void operator+=(char ch);      // append char
  void operator+=(const str &s); // append str s
  int size() const;              // return number of chars
};

std::ostream& operator<<(std::ostream& out, const str &s);