![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
有如下程序: #include"iostream" using namespace std; class Base1{ public: Base1(int d) {cout< ~Base1(){} }; class Base2{ public: Base2(int d) {cout< ~Base2 (){} }; class Derived:public Base1, Base2{ public: Derived(int a, int b, int c, int d) : Base1(b) , Base2(a) , b1(d) , b2(c) {} private: int b1; int b2; }; int main() { Derived d(1, 2, 3, 4); return 0; } 运行时的输出结果是( )。