support bazel complie this project and format code.

basic_content/bit/BUILD

@@ -0,0 +1,7 @@
+# please run `bazel run basic_content/bit:bit`
+load("@rules_cc//cc:defs.bzl", "cc_binary")
+
+cc_binary(
+    name = "bit",
+    srcs = ["bit.cpp"],
+)

basic_content/bit/README.md

@@ -108,7 +108,7 @@ struct stuff
 
 这里 stuff.field1 与 stuff.field2 之间有一个 2 Bits 的空隙，stuff.field3 则存储在下一个 unsigned int 中，该结构现在大小为 3 * 32 = 96 Bits。
 
-学习代码见：[learn.cpp](learn.cpp)
+学习代码见：[bit.cpp](bit.cpp)
 
 ## 位域的初始化和位的重映射
 

basic_content/bit/bit.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+
+using namespace std;
+struct stuff {
+  unsigned int field1 : 30;
+  unsigned int : 2;
+  unsigned int field2 : 4;
+  unsigned int : 0;
+  unsigned int field3 : 3;
+};
+int main() {
+  struct stuff s = {1, 3, 5};
+  cout << s.field1 << endl;
+  cout << s.field2 << endl;
+  cout << s.field3 << endl;
+  cout << sizeof(s) << endl;
+  return 0;
+}

basic_content/bit/learn.cpp

@@ -1,19 +0,0 @@
-#include<iostream>
-
-using namespace std;
-struct stuff 
-{
-    unsigned int field1: 30;
-    unsigned int       : 2;
-    unsigned int field2: 4;
-    unsigned int       : 0;
-    unsigned int field3: 3; 
-};
-int main(){
-    struct stuff s={1,3,5};
-    cout<<s.field1<<endl;
-    cout<<s.field2<<endl;
-    cout<<s.field3<<endl;
-    cout<<sizeof(s)<<endl;
-    return 0;
-}