单项选择题

若有以下程序：
#include ＜iostream＞
using namespace std;
class Base

int x;
protected:
int y;
public:
int z;
void setx(int i)

x=i;

int getx ( )

return x;

;
class Inherit : private Base

private:
int m;
public:
int p;
void setvalue(int a,int b,int c, int d)

setx(