support bazel complie this project and format code.

basic_content/abstract/interesting_facts3.cpp

@@ -6,24 +6,23 @@
  * @date 2019-07-20
  */
 
-#include<iostream> 
-using namespace std; 
+#include <iostream>
+using namespace std;
 
-class Base
-{ 
-    int x; 
-public: 
-    virtual void show() = 0; 
-    int getX() { return x; } 
-}; 
-class Derived: public Base 
-{ 
-public: 
-//    void show() { } 
-}; 
-int main(void) 
-{ 
-    Derived d;  //error! 派生类没有实现纯虚函数，那么派生类也会变为抽象类，不能创建抽象类的对象
-    return 0; 
-} 
+class Base {
+  int x;
 
+public:
+  virtual void show() = 0;
+  int getX() { return x; }
+};
+class Derived : public Base {
+public:
+  //    void show() { }
+};
+int main(void) {
+  Derived
+      d; // error!
+         // 派生类没有实现纯虚函数，那么派生类也会变为抽象类，不能创建抽象类的对象
+  return 0;
+}