Further cleaning up of class examples

Examples/pike/class/example.cxx

@@ -1,46 +1,28 @@
-/* File : example.c */
+/* File : example.cxx */
 
 #include "example.h"
-
-#include <stdio.h>
-
 #define M_PI 3.14159265358979323846
 
-// Static member initializer
-int Shape::nshapes = 0;
-
-// Constructor
-Shape::Shape() {
-  nshapes++;
-}
-
-// Move the shape to a new location
+/* Move the shape to a new location */
 void Shape::move(double dx, double dy) {
   x += dx;
   y += dy;
 }
 
-// Destructor
-Shape::~Shape() {
-  nshapes--;
-}
+int Shape::nshapes = 0;
 
-// Circle area
-double Circle::area() const {
+double Circle::area() {
   return M_PI*radius*radius;
 }
 
-// Circle perimeter
-double Circle::perimeter() const {
+double Circle::perimeter() {
   return 2*M_PI*radius;
 }
 
-// Square area
-double Square::area() const {
+double Square::area() {
   return width*width;
 }
 
-// Square perimeter
-double Square::perimeter() const {
+double Square::perimeter() {
   return 4*width;
 }