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#include <iostream> using namespace std; class Point { public: double x() const { return x_; } double y() const { return y_; } double x(double xx) { x_ = xx; } double y(double yy) { y_ =yy; } public: void showPoint() const { cout << "2D Point (" << this->x_ << "," << y_ <<")" << endl; } static int showNumber() { return num; } public: Point( ) { num++; } Point(double xx, double yy) : x_(xx), y_(yy) { num++; } protected: double x_, y_; static int num; }; class Point_3D : public Point { public: static int showNumber(){ return num1; } void showPoint( ) const { cout << "3D Point (" << x_ << "," << y_ << "," << z_ << ")" << endl; } void setPoint(double xx,double yy, double zz) { x_ = xx; y_ = yy; z_ = zz;} double z()const { return z_;} double z(double zz) { z_ = zz; } public: Point_3D():Point() { num1++; } Point_3D(double xx,double yy, double zz):Point(xx,yy), z_(zz) { num1++; } private: double z_; static int num1; }; int Point::num = 0; int Point_3D::num1 = 0; int main() { cout<<"Invariable test output :"<<endl; Point_3D p3d; p3d.setPoint(-100, 0, 100); p3d.showPoint(); p3d.x(0); p3d.y(100); cout<<"Point ("<<p3d.x()<<","<<p3d.y()<<","<<p3d.z()<<")"<<endl; cout<<"\nTest data output :"<<endl; int cases; cin>>cases; for(int i = 1; i <= cases; i++) { double x, y, z; int point_type; cin>>point_type; if(point_type == 2) { cin>>x>>y; Point p(x, y); p.showPoint(); } if(point_type == 3) { cin>>x>>y>>z; Point_3D p(x, y, z); p.showPoint(); } } cout<<"Number of 2D Points : "<<Point::showNumber() - Point_3D::showNumber()<<endl; cout<<"Number of 3D Points : "<<Point_3D::showNumber() - 1<<endl; }