定义一个CPoint类，利用成员函数的重载实现整数的两点间距离和浮点数的两点间距离。要求：

(1) 分别用int，float数值类型设计成员函数重载；

(2) 分别用int，float的数值测试该程序。-Define a CPoint class using overloaded member function implementations between two integer and floating-point distance between two points distance. Requirements: (1) respectively int, float design value type member function overloading　(2) respectively int, float value test the program.