support bazel complie this project and format code.

practical_exercises/key_exercises/io_operator.cpp

@@ -0,0 +1,40 @@
+/* 输入输出重载.cpp */
+#include <iostream>
+using namespace std;
+#include <cstring>
+class Sales {
+private:
+  char name[10];
+  char id[18];
+  int age;
+
+public:
+  Sales(char *Name, char *ID, int Age);
+  friend Sales &operator<<(ostream &os, Sales &s);
+  friend Sales &operator>>(istream &is, Sales &s);
+};
+
+Sales::Sales(char *Name, char *ID, int Age) {
+  strcpy(name, Name);
+  strcpy(id, ID);
+  age = Age;
+}
+
+Sales &operator<<(ostream &os, Sales &s) {
+  os << s.name << "\t" << s.id << "\t" << s.age << endl;
+  return s;
+}
+
+Sales &operator>>(istream &is, Sales &s) {
+  cout << "输入雇员的姓名，身份证，年龄：\n";
+  is >> s.name >> s.id >> s.age;
+}
+
+int main(int argc, char const *argv[]) {
+  Sales s("张三", "15611", 26);
+  cout << s;
+  cin >> s;
+  cout << s;
+  
+  return 0;
+}