static public int Main () {
Obj rect, circle;
double sum;
rect = new Rect (0, 0, 10, 20);
circle = new Circle (0, 0, 20);
sum = rect.Area() + circle.Area ();
/* surprise! this calls Obj.Area... */
if (sum != 0.0)
return 1;
/* now call the derived methods */
sum = ((Rect)rect).Area() + ((Circle)circle).Area ();
if (sum != (200 + 400*System.Math.PI))
return 2;
/* let's try to cast to the interface, instead */
sum = ((Measurable)rect).Area() + ((Measurable)circle).Area ();
if (sum != 0.0)
return 3;
return 0;
}
public static int Main()
{
Obj
rect,
circle;
double
sum;
rect
=
new
Rect
(0,
0,
10,
20);
circle
=
new
Circle
(0,
0,
20);
sum
=
rect.Area()
+
circle.Area
();
if
(sum
!=
0.0)
return
1;
sum
=
((Rect)rect).Area()
+
((Circle)circle).Area
();
if
(sum
!=
(200
+
400*System.Math.PI))
return
2;
sum
=
((Measurable)rect).Area()
+
((Measurable)circle).Area
();
if
(sum
!=
0.0)
return
3;
return
0;
}