错在哪儿呀？该怎么解决

错在哪儿呀？

 class base {

  int m;
  public:
  base(int a):m(a);
  int Getx(){return m;}

  };

class derived:private base{

public:
  derived(int b):m(b){};
};

[解决办法]

C/C++ code

derived(int b):base(b){}; // m 在子类中不可访问