有以下程序: #include <iostream> using namespace std; class Base { private: int a,b; public: Base(int x, int y) {a=x;b=y; } void Show() {cout<<a<< ’,’ <<b<<end1; } }; class Derived : public Base { private: int c; public: Derived(int x, int y, int z) : Base(x,y),c(z) {} void Show() {cout<<c<<end1; } }; int main() { Base b(50,50),*pb; Derived d(10,20,30); pb=&d; pb->Show(); return 0; } 运行后的打印结果为 【14】