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class CString{public:	CString(const char *str = NULL);	//普通构造函数	CString(const CString &other);		//拷贝构造函数	~CString();							//析构函数	CString &operator = (const CString &other); //赋值函数private:	char *m_data;		//用于保存字符串	};CString::CString(const char *str){	if (str==NULL)	{		m_data = new char[1];		*m_data = '\0';	}	else	{		int length = strlen(str);		m_data = new char[length+1];		strcpy(m_data,str);	}}CString::~CString(){	delete[] m_data;}CString::CString(const CString &other){	int lenght = strlen(other.m_data);	m_data = new char[lenght+1];	strcpy(m_data, other.m_data);}CString& CString::operator = (const CString &other){	if (this==&other)		return *this;	delete[] m_data;	int length = strlen(other.m_data);	m_data = new char[length+1];	strcpy(m_data, other.m_data);	return *this;}

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