静态成员函数调用

#include
class teach
{private:
 static int counter;
 int id;
public:
 teach();
     void show();
  static void setcounter(int);
  };
  int teach::counter=1;//静态数据成员初始化
  teach::teach()
  {id=counter++;;
  }
  void teach::show()
  {cout<   }
  void teach::setcounter(int new_counter)
  {counter=new_counter;
  }
 int main()
  {teach s1;
  s1.show();
  teach s2;
  s2.show();
  teach s3;
  s3.show();
  s1.setcounter(10);//重新设置计数器
  teach s4;
  s4.show();
  teach s5;
  s5.show();
  return 0;
  }