填空题

有以下程序：
#include ＜iostream＞
using namespace std;
class Base
public:
Base()
x=0;
int x;
;
class Derivedl: virtual public Base
public:
Derived1()
x=10;
;
class Derived2: virtual public Base
public:
Derived2()
x=20;
;
class Derived: public Derived1,protected Derived2
;
int main()
Derived obj;
cout＜＜obj.x＜＜endl;
return 0;
该程序运行后的输出结果是 【14】 。

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