using System;
class Rectangle {
Point a, b;
public Rectangle(int upLeftX, int upLeftY, int downRightX, int downRightY) {
this.a = new Point(upLeftX, upLeftY);
this.b = new Point(downRightX, downRightY);
}
public override bool Equals(Object obj) {
if (obj == null || GetType() != obj.GetType()) return false;
Rectangle r = (Rectangle)obj;
return a.Equals(r.a) && b.Equals(r.b);
}
public override int GetHashCode() {
return a.GetHashCode() ^ b.GetHashCode();
}
}
class Point {
private int x;
private int y;
public Point(int X, int Y) {
this.x = X;
this.y = Y;
}
public override bool Equals (Object obj) {
if (obj == null || GetType() != obj.GetType()) return false;
Point p = (Point)obj;
return (x == p.x) && (y == p.y);
}
public override int GetHashCode() {
return x.GetHashCode() ^ y.GetHashCode();
}
}
class MyClass {
public static void Main() {
Rectangle r1 = new Rectangle(0, 0, 100, 200);
Rectangle r2 = new Rectangle(0, 0, 100, 200);
Rectangle r3 = new Rectangle(0, 0, 150, 200);
if (r1.Equals(r2)) {
Console.WriteLine("Rectangle r1 equals rectangle r2!");
}
if (!r2.Equals(r3)) {
Console.WriteLine("But rectangle r2 does not equal rectangle r3.");
}
}
}
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