下列代码中，s1->draw();和s2->draw();输出不同结果的主要原因是？
class Shape {
public:
virtual void draw() {
cout << "绘制图形" << endl;
}
virtual ~Shape() {};
};
class Circle : public Shape {
public:
void draw() override {
cout << "绘制圆形" << endl;
}
};
class Rectangle : public Shape {
public:
void draw() override {
cout << "绘制矩形" << endl;
}
};
int main() {
Shape* s1 = new Circle();
Shape* s2 = new Rectangle();
s1->draw();
s2->draw();
delete s1;
delete s2;
return 0;
}
