#include <iostream> using namespace std; class Base { private: int x; int y; public: Base(int x, int y) { this->x = x; this->y = y; } int getX() { return x; } int getY() { return y; } }; class Sub : public Base { private: int z; public: Sub(int x, int y, int z):Base(x,y) { // write your ...