写main函数¶
int main()
{
Circle circle(2.4);
cout << "圆的面积是: ";
printArea(circle);
Rectangle rectangle(1.3, 1.4);
cout <<"矩形的面积是: ";
printArea(rectangle);
Triangle tri(2.4, 5.9);
cout << "三角形的面积是:";
printArea(tri);
return 0;
}