若有以下程序： #include ＜iostream＞ using namespace std; class Base { public: Base() { x=0; } int x; }; class Derived

admin2013-05-30 35

问题若有以下程序：
#include ＜iostream＞
using namespace std;
class Base
{
public:
Base()
{
   x=0;
}
int x;
};
class Derived1: 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＜＜end1;
return 0;
}
该程序运行后的输出结果是【  】。

选项

答案20

解析

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本试题收录于：二级C题库NCRE全国计算机二级分类