Area program in cpp using inheritance

#include <iostream>
using namespace std;
class shape
{
protected:
int length;
int breadth;
public:
void setlength(int l)
{
length=l;
}
void setwidth(int w)
{
breadth=w;
}
};
class rectangle:public shape
{
public:
int area()
{
return length*breadth;
}
};
int main()
{
rectangle r;
r.setlength(5);
r.setwidth(10);
cout<<"area is:"<<r.area();
return 0;
}

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