#include <iostream>
#include <cstring>
using namespace std;

// struct people {
class people {
// private 定义私有的成员和函数
private:
  char *name;
  int age;

// public 定义公开的成员和函数
public:
  people(){
    cout << "default constructor invoke!" << endl;
  }

  // 构造函数，带默认值
  people(char *n="no_name", int a=15) {
    int l = strlen(n);
    name = new char(l+1);
    strcpy(name, n);
    age = a;
    cout << "constructor invoke!" << endl;
  }

  char *get_name() {
    return name;
  }
  void set_name(char *n="no_name") {
    int l = strlen(n);
    name = new char(l+1);
    strcpy(name, n);
  }
  int get_age() { return age; }
  void set_age(int a) { age = a; }

  void print() {
    cout << "{name: " << name << ", age: " << age << "}" << endl;
  }

  // 声明类体外函数
  void print2();

  virtual ~people() {
    delete[] name;
    cout << "destructor invoke!" << endl;
  }
};

// 类体外定义方法（成员函数），必须在类定义中声明，类体外要有类作用域

void people::print2() {
  cout << "{name: " << name << ", age: " << age << "}" << endl;
}

int main() {
  // people p1();
  people p2("zhangsan", 18);
  people p3("lisi", 19);
  // p1.print();
  p2.print();
  p3.print();

  p2.set_name("xyz");
  cout << p2.get_name() << endl;

  // 调用类体外函数
  p2.print2();

  return 0;
}