[완료]VC++와 Eclipse CDT (MinGW) 에러나는게 다른데 정상인가요?

#include <iostream>
 
using namespace std;
 
// 기본 클래스
class Polygon {
protected:
	int m_h;
	int m_b;
public:
	Polygon( int _h=0, int _b=0 ) : m_h(_h), m_b(_b) {
		cout << "Polygon 생성됨\n";
	}
	virtual void ShowArea() { cout << "Area:Polygon" << endl; }
};
 
// Polygon을 상속받는 사각형 
class Rectangle : public Polygon {
public:
	Rectangle( int _h, int _b ) : Polygon( _h, _b ) {  //---> 1번
		cout << "Rectangle 생성됨\n";
	}
	void ShowArea() { cout << "Area:Rectangle=" << m_h*m_b<< endl; }
};
 
// 삼각형
class Triangle : public Polygon {
public:
	Triangle( int _h, int _b ) : Polygon( _h, _b ) {
		cout << "Triangle 생성됨\n";
	}
	void ShowArea() { cout << "Area:Triangle=" << (m_h*m_b)/2 << endl; }
};
 
int main(){
	Polygon *P=NULL; //----> 2번
	Rectangle o_R( 2, 4 );
	Triangle o_T( 3, 5 );
 
	P = &o_R;
	(*P).ShowArea();
 
	P = &o_T;
	P->ShowArea();
 
        delete P;       //-----> 2번
	return 0;
}