Improve the class example for several languages.

Fix numerous inaccuracies in index.html (where it exists) and eliminate
unnecessary differences between the example code being wrapped.

Examples/php/class/example.cxx

@@ -1,14 +1,7 @@
-/* File : example.c */
+/* File : example.cxx */
 
 #include "example.h"
-#include <math.h>
-#ifndef M_PI
-#  define M_PI 3.14159265358979323846
-#endif
-
-int Shape::get_nshapes() {
-  return nshapes;
-}
+#define M_PI 3.14159265358979323846
 
 /* Move the shape to a new location */
 void Shape::move(double dx, double dy) {
@@ -18,22 +11,18 @@ void Shape::move(double dx, double dy) {
 
 int Shape::nshapes = 0;
 
-void Circle::set_radius( double r ) {
-  radius = r;
-}
-
-double Circle::area(void) {
+double Circle::area() {
   return M_PI*radius*radius;
 }
 
-double Circle::perimeter(void) {
+double Circle::perimeter() {
   return 2*M_PI*radius;
 }
 
-double Square::area(void) {
+double Square::area() {
   return width*width;
 }
 
-double Square::perimeter(void) {
+double Square::perimeter() {
   return 4*width;
 }

Examples/php/class/example.h

@@ -10,10 +10,9 @@ public:
   }
   double  x, y;
   void    move(double dx, double dy);
-  virtual double area(void) = 0;
-  virtual double perimeter(void) = 0;
+  virtual double area() = 0;
+  virtual double perimeter() = 0;
   static  int nshapes;
-  static  int get_nshapes();
 };
 
 class Circle : public Shape {
@@ -21,10 +20,8 @@ private:
   double radius;
 public:
   Circle(double r) : radius(r) { }
-  ~Circle() { }
-  void set_radius( double r );
-  virtual double area(void);
-  virtual double perimeter(void);
+  virtual double area();
+  virtual double perimeter();
 };
 
 class Square : public Shape {
@@ -32,7 +29,6 @@ private:
   double width;
 public:
   Square(double w) : width(w) { }
-  ~Square() { }
-  virtual double area(void);
-  virtual double perimeter(void);
+  virtual double area();
+  virtual double perimeter();
 };

Examples/php/class/runme.php

@@ -14,7 +14,7 @@ print "    Created square\n";
 
 # ----- Access a static member -----
 
-print "\nA total of " . Shape::get_nshapes() . " shapes were created\n";
+print "\nA total of " . Shape::nshapes() . " shapes were created\n";
 
 # ----- Member data access -----
 
@@ -54,7 +54,7 @@ $s = NULL;
 # the square.
 $o = NULL;
 
-print Shape::get_nshapes() . " shapes remain\n";
+print Shape::nshapes() . " shapes remain\n";
 print "Goodbye\n";
 
 ?>