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 dl; public: A(int x): dl(x){ } void dispaO cout<<dl.x<<","; } }; class B: public A { private: data d2; public: B(int x):A(x-1),d2(x){ } void dispb() { cout<<d2.x<<endl; } }; class C: public B { public: C(int x):B(x-1){ } void disp0 { dispa(); dispb(); } }; int main() { C obj(5); obj.disp(); return 0; } 程序执行后的输出结果是( )。
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