io_operator_overload.cpp

/* 输入输出运算符重载.cpp */
/*
   有一销售人员类Sales，其数据成员有姓名name，身份证号id，年龄age。
   重载输入/输出运算符实现对Sales类数据成员的输入和输出。
 */
#include <cstring>
#include <iostream>
using namespace std;
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); //重载输出运算符
  friend Sales &operator>>(istream &is, Sales &s); //重载输入运算符
};
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"; //输出姓名
  os << s.id << "\t";   //输出身份证号
  os << s.age << endl;  //输出年龄
  return s;
}
Sales &operator>>(istream &is, Sales &s) {
  cout << "输入雇员的姓名，身份证号，年龄" << endl;
  is >> s.name >> s.id >> s.age;
  return s;
}
int main() {
  Sales s1("杜康", "214198012111711", 40); // L1
  cout << s1;                              // L2
  cout << endl;                            // L3
  cin >> s1;                               // L4
  cout << s1;                              // L5
}