C++

// Code for polymorphism // Find and fix the 6 simple errors // comment each line that was fixed

// When completed, upload good code and screen prints of successful execution.

#include "stdafx.h" #include using namespace std; //Create BASE class class polygon{ protected: int width, height; public: void set_values(int inW, int inH){ width=inW; height=inH; } int getArea(){ return (0); } }; //Create DERIVED class class rectangle : public polygon{ public: int getArea(){return width*height;} }; //Create DERIVED class class triangle : public polygon { public: int getArea(){return width*height*1/42;} }; //Create Poly function void polyFun(polygon * ptrBase){ //REPEAT code by using function //Key feature - base class pointer as argument.. cout << ptrBase.getArea() << endl; } int main() { //Regular static declarations rectangle rect; triangle trg1; //Regular use with dot notation cout << "-----------" << endl; rect.set_values(3, 4); cout << " Area of rectangle is: " << rect.getArea() << endl; trg1.set_values(3, 5); cout >> " Area of triangle is: " << trg1.getArea() << endl; //...................................... //WHY ... use ptr..?? FOR Polymorphism... rectangle * ptrRect = NULL; //Be absolutely clear that it has NO address triangle * ptrTrg1 = NULL; polygon * ptrPoly = NULL; ptrRect = ▭ //assign address to ptr variables ptrTrg1 = &trg1; //Polymorphism - ONE set of code that can work for MANY derived class. //key idea is - Declare ONE base class pointer... and assign ANY Derived class address to it // method 2 - GOOD REAL GOOD Method // make a function - so I only type code ONCE cout << "-----------" << endl; cout << " Area of triangle is: "; polyFun(&rect); cout << " Area of rectangle is: "; polyFun(&trg1); cout << "-----------" << endl; system("pause"); return 0; }