6.13#include<bits/stdc++.h>using namespace std;class base{ protected: double h; public: base(double h1){ h=h1; } virtual void disp() { } };class cuboid:public base{ public: cuboid(double c,double k,double h):base(h) { chang=c,kuan=k; } void disp(){ cout<<"长方体体积："<<chang*kuan*h; } private: double chang,kuan;};class cylinder:public base{ public: cylinder(double r,double h):base(h) { radius=r; } void disp(){ cout<<"\n圆柱体体积："<<3.14*radius*radius*h; } private: double radius;};int main(){ base *pc; cuboid a(3,4,5); cylinder b(3,4); pc=&a; pc->disp(); pc=&b; pc->disp(); return 0;}