class String

{

public:

    String(const char *str = "");

    ~String(void);

    String(const String &other);

    String &operator =(const String &other);

    size_t size(void) const;

    const char *c_str(void);

private:

    char *m_str;

};

String::String(const char *str)

{

    int len = strlen(str);

    m_str = new char[len + ];

    strcpy(m_str, str);

}

String::~String(void)

{

    delete []m_str;

}

String::String(const String &other)

{

    int len = strlen(other.m_str);

    m_str = new char[len + ];

    strcpy(m_str, other.m_str);

}

String& String::operator=(const String &other)

{

    if (other == *this)

        return *this;

    delete []m_str;

    int len = strlen(other.m_str);

    m_str = new char[len + ];

    strcpy(m_str, other.m_str);

    return *this;

}

size_t String::size(void)

{

    return strlen(m_str);

}

const char* String::c_str(void)

{

    return m_str;

}