support bazel complie this project and format code.

practical_exercises/key_exercises/read_file.cpp

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+/* 读写文件综合题.cpp */
+#include <cstring>
+#include <fstream>
+#include <iostream>
+#include <vector>
+using namespace std;
+
+class Person {
+public:
+  Person() {}
+  Person(char *name, char *id, int math, int chinese, int english) {
+    strcpy(Name, name);
+    strcpy(Id, id);
+    Math = math;
+    Chinese = chinese;
+    English = english;
+    Sum = Math + Chinese + English;
+  }
+
+  void display() {
+    cout << Name << "\t" << Id << "\t" << Math << "\t" << Chinese << "\t"
+         << English << "\t" << Sum << endl;
+  }
+
+private:
+  char Name[20];
+  char Id[20];
+  int Math;
+  int Chinese;
+  int English;
+  int Sum;
+};
+
+int main(int argc, char const *argv[]) {
+  char ch;
+  char Name[20], Id[20];
+  int Math, Chinese, English;
+  fstream ioFile;
+  ioFile.open("d:/per.dat", ios::out | ios::app);
+  cout << "---------建立学生档案信息----------\n";
+  do {
+    cout << "请输入姓名：";
+    cin >> Name;
+    cout << "请输入身份证号：";
+    cin >> Id;
+    cout << "请输入数学成绩：";
+    cin >> Math;
+    cout << "请输入汉语成绩：";
+    cin >> Chinese;
+    cout << "请输入英语成绩：";
+    cin >> English;
+    Person per(Name, Id, Math, Chinese, English);
+    ioFile.write((char *)&per, sizeof(per));
+    cout << "您是否继续建档？(Y/y)  ";
+    cin >> ch;
+  } while (ch == 'y' || ch == 'Y');
+  ioFile.close();
+  ioFile.open("d://per.dat", ios::in);
+  Person p;
+  ioFile.read((char *)&p, sizeof(p));
+  vector<Person> v;
+  vector<Person>::iterator vt;
+  while (!ioFile.eof()) {
+    v.push_back(p);
+    ioFile.read((char *)&p, sizeof(p));
+  }
+  ioFile.close();
+  cout << "---------输出档案信息-----------" << endl;
+  for (vt = v.begin(); vt != v.end(); vt++) {
+    (*vt).display();
+  }
+  
+  return 0;
+}