For the following class definition in C++, which lines will cause errors?

class cl
  static int x;
public :
  static int y;
  static void f2();
  void f1();

int cl::x=1;
int cl::y=2;
void cl::f1()
    x++; y++; // 1 
void cl::f2()
  x++; y++; //2 
void f3()
    cl::x++; cl::y++; // 3
Line number 3, since the function outside the class has only access to public class variables.

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