在线等c++题,定义一个point类,拥有静态数据成员X,Y;构造函数,输入坐标...答:include <cstdio>#include <cmath>const double PI = acos(-1);class point{protected:double X, Y;public:point(double x = 0, double y = 0): X(x), Y(y) {}void input(){scanf("%lf %lf", &X, &Y);}void output(){printf("%f %f\n", X, Y);}};class circle : ...