有以下程序：
included＜iostream＞
using namespace std;
class Base
{
public:
B．ase( )
{
x=0;
}
int x;
};
class Derived1:virtual public Base
{
public:
D．erived1( )
{
x=10;
}
};
class Derived2:virtual public Base
{
public:
D．erived2( )
{
x=20;
}
};
class Derived: public Derived1,protected Derived2
{ };
int main( )
{
D．erived obj;
cout＜＜obj. x＜＜endl;
return 0;
}
该程序运行后的输出结果是______。
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