进制转换器类：1.数据成员，整数；2.构造函数：①无参数；②1个整数参数；③ 拷贝构造函数；④传入指定进制的字符串做为参数；3.toString成员函数，提供1个参数，对应的整数按指定的进制转换为字符串并输出；4.主程序对其功能进行测试-M-type converter: 1. Data member, an integer　2. Constructor: ① no parameters　② 1 integers parameters　③ copy constructor　④ into hexadecimal string specified as a parameter　3.toString member functions to provide a parameter, corresponding to an integer by the specified string converted to hexadecimal and output　4. the main program to test its function