class CStr {
	char *pData;
	int nLength;

public:
	CStr();					// replace default constructor
	CStr(char *s);			// typecasting constructor
	CStr(const CStr &str);	// override default copy constructor
	~CStr();				// override default destructor

	CStr& operator=(const CStr &source) // override default assignment
		{ cpy(source.get()); return *this; }
	
	CStr& operator+=(CStr &str)
		{ cat(str.get()); return *this; }
	CStr& operator+=(char *s)
		{ cat(s); return *this; }

	operator const char*() {return get();} // conversion function

	char *get(void) const {return pData;}
	int getlength(void) const {return nLength;}
	void cpy(char *s);
	void cat(char *s);

	CStr friend operator+(CStr str1, CStr str2);

	/**** not needed because of CStr::CStr(Char *s)
	CStr friend operator+(char *s, CStr str);
	CStr friend operator+(CStr str, char *s);
	****/

};