C++ programming:

/ 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;
}