update dir

const/class_const/static_example/apple.cpp

@@ -0,0 +1,14 @@
+class Apple
+{
+private:
+    int people[100];
+public:
+    Apple(int i);
+    static int ap; //在类实现文件中定义并初始化
+    static const int apple_number;
+    void take(int num) const;
+    int add(int num);
+    int add(int num) const;
+    int getCount() const;
+};
+