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#include <iostream>using namespace std;class CPolygon {  protected:    int width, height;  public:    void set_values (int a, int b)      { width=a; height=b;}  };class CRectangle: public CPolygon {  public:    CRectangle() : width(3) {}    int area ()      { return (width * height); }  };Compile error:$ g++ poly.cpp poly.cpp: In constructor ‘CRectangle::CRectangle()’:poly.cpp:15: error: class ‘CRectangle’ does not have any field named ‘width’