定义Point,Circle,Cylinder类.用友元求(friend)圆面积,圆柱体体积.

题目

定义Point,Circle,Cylinder类.用友元求(friend)圆面积,圆柱体体积.

答案

#include using namespace std;const double PI = 3.141592653;class Point{public:x05double X;x05double Y;public:x05Point() :X(0),Y(0){};x05Point(double x,double y) :X(x),Y(y){};};class Circle :public...