有如下程序： #include＜iostream＞ using namespace std class Base{ int b; public: Base(int i) {b=i;} Void disp ( ) {cout＜＜"Base:b="＜＜b＜＜’’; } }; class Base1:virtual public Base{ public: Base1(int i):Base(i){} }; class Base2:virtual public Base{ public: Base2(int i):Base(i){} }; class Derived:public Base2. public Base1{ int d; public: Derived(int i ,int j):Base1(j),Base2(j), 【12】 { d=i; } void disp() {cout＜＜"Derived:d="＜＜d＜＜’ ’;} }; int main() Derived objD(1,2);objD. disp() objD. Base::disp(); objD. Base1::disp() objD. Base2::disp(); return 0; } 请将程序补充完整，使程序在运行时输出： Derivd:d=1 Base:b＝2 Base:b=2 Base:b=2