support bazel complie this project and format code.

practical_exercises/10_day_practice/day5/inherit_access/public.cpp

@@ -0,0 +1,27 @@
+#include <iostream>
+using namespace std;
+class Base {
+  int x;
+
+public:
+  void setx(int n) { x = n; }
+  int getx() { return x; }
+  void showx() { cout << x << endl; }
+};
+//私有继承
+//基类的中的public成员在派生类中是private, private成员在派生类中不可访问。
+class derived : private Base {
+  int y;
+
+public:
+  void sety(int n) { y = n; }
+  void sety() { y = getx(); }
+  void showy() { cout << y << endl; }
+};
+int main() {
+  derived obj;
+  obj.setx(10); // cannot access
+  obj.sety(20);
+  obj.showx(); // cannot access
+  obj.showy();
+}