帮忙指出错误指点指点谢了
#include<iostream>
using namespace std;
class X{
private:
static int i;
friend class Z;
friend void h(X&x1);
friend void g(X&x3);
}
class Z{
public:
void f(X&x2);
}
class Y{
public:
void g(X&x3);
}
void h(X&x1){
cout<<"friend h i="<<x1.i+5;
}
void Y::g(X&x3){
cout<<"friend g i="<<x3.i++;
}
void Z::f(X&x2){
cout<<"friend f i="<<x2.i+10;
}
int main(){
X x1,x2,x3;
h(x1);
Y y;
y.g(x3);
Z z;
z.f(x2);
system("pause");
return 0;
}




[解决办法]

C/C++ code

#include<iostream>using namespace std;class X{ // private:  public : //static成员属于整个类，需要定义public的          static int i;  friend class Z;  friend void h(X&x1);  friend void g(X&x3);  }; //需要加；的哈     //static成员需要在类外面定义    int X::i = 0;    class Z{  public:  void f(X&x2);  };     class Y{  public:  void g(X&x3);  };  void h(X&x1){  cout<<"friend h i="<<x1.i+5;  }  void Y::g(X&x3){  cout<<"friend g i="<<x3.i++;  }  void Z::f(X&x2){  cout<<"friend f i="<<x2.i+10;  }    int main(){  X x1,x2,x3;  h(x1);  Y y;  y.g(x3);  Z z;  z.f(x2);  system("pause");  return 0;  }