若有以下程序: #include<iostream> using namespace std; class data { public: int x; data(int x) { data::x=x; } }; class A { private:data d1; public:A(int x):d1(x){}void dispa() {cout<<d1.X<<","; } }; classB:public A { private: data d2; public: B(int x):A(x-1),d2(x){} void dispb() {cout<<d2.x<<end1; } }; class C:public B { public:C(int x):B(x-1){}void disp(){ dispa(); dispb();} }; int main() {C obj(5);obj.disp();return 0; } 程序执行后的输出结果是
A.5,5
B.4,5
C.3,4
D.4,3