support bazel complie this project and format code.

basic_content/c_poly/BUILD

@@ -0,0 +1,13 @@
+# please run `bazel run basic_content/c_poly:c_examp`
+# please run `bazel run basic_content/c_poly:c++_examp`
+load("@rules_cc//cc:defs.bzl", "cc_binary")
+
+cc_binary(
+    name = "c_examp",
+    srcs = ["c_examp.c"],
+)
+
+cc_binary(
+    name = "c++_examp",
+    srcs = ["c++_examp.cpp"],
+)

basic_content/c_poly/c++_examp.cpp

@@ -9,34 +9,31 @@
 #include <iostream>
 
 using namespace std;
-class A
-{
-    public:
-        virtual void f()//虚函数实现
-        {
-            cout << "Base A::f() " << endl;
-        }
+class A {
+public:
+  virtual void f() //虚函数实现
+  {
+    cout << "Base A::f() " << endl;
+  }
 };
 
-class B:public A    // 必须为共有继承，否则后面调用不到，class默认为私有继承！
+class B : public A // 必须为共有继承，否则后面调用不到，class默认为私有继承！
 {
-    public:
-        virtual void f()//虚函数实现,子类中virtual关键字可以没有
-        {
-            cout << "Derived B::f() " << endl;
-        }
+public:
+  virtual void f() //虚函数实现,子类中virtual关键字可以没有
+  {
+    cout << "Derived B::f() " << endl;
+  }
 };
 
+int main() {
+  A a; //基类对象
+  B b; //派生类对象
 
-int main() 
-{
-    A a;//基类对象
-    B b;//派生类对象
+  A *pa = &a; //父类指针指向父类对象
+  pa->f();    //调用父类的函数
 
-    A* pa = &a;//父类指针指向父类对象
-    pa->f();//调用父类的函数
-
-    pa = &b; //父类指针指向子类对象，多态实现
-    pa->f();//调用派生类同名函数
-    return 0;
+  pa = &b; //父类指针指向子类对象，多态实现
+  pa->f(); //调用派生类同名函数
+  return 0;
 }