tasks a-s

Task/Polymorphism/D/polymorphism.d

@@ -0,0 +1,36 @@
+import std.stdio: writeln;
+
+class Point {
+    private int x, y;
+    this(int x_=0, int y_=0) { x = x_; y = y_; }
+    this(Point p_) { x = p_.getX(); y = p_.getY(); }
+    int getX() { return x; }
+    void setX(int x_) { this.x = x_; }
+    int getY() { return y; }
+    void setY(int y_) { this.y = y_; }
+}
+
+class Circle : Point {
+    private int r;
+    this(int x_=0, int y_=0, int r_=0) {
+        super(x_, y_);
+        r = r_;
+    }
+    this(Point p, int r_=0) {
+        super(p);
+        r = r_;
+    }
+    this(Circle c_) {
+        super(c_.getX(), c_.getY());
+        r = c_.getR();
+    }
+    int getR() { return r; }
+    void setR(int r0) { this.r = r0; }
+}
+
+void main() {
+    auto p = new Point();
+    auto c = new Circle();
+    writeln(p);
+    writeln(c);
+}