Simple program of Abstract class C++

#include<iostream>
using namespace std;
class shape
{
  public:
    virtual int getA()=0;
    int setwid(int wid)
    {
    width=wid;
}
int sethei(int h)
{
height=h;
}

protected:
          int height,width;
          
};


class rectangle:public shape
{
  public:
    int getA()
    {
    return (height*width);
}
} ;


class triangle:public shape
{
  public:
    int getA()
    {
    return (height*width/2);
}
};  


int main()
{
rectangle r; 
triangle t;

r.setheig(7);
r.setwid(5);

cout<<"total rectangle area : "<<r.getA()<<endl;

t.setheig(7);
t.setwid(5);

cout<<"total triangle area : "<<t.getA()<<endl;

return 0;
}

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