6.13

来源：互联网发布：手写笔绘画软件编辑：程序博客网时间：2024/05/17 12:23

#include<iostream>using namespace std;class Base{protected:double h;public:virtual void disp(){}   //虚函数dispBase(){}Base(double h1)         {h=h1;}};class Cuboid:public Base    //定义长方体派生类{private:double w,l;public:Cuboid(double a=0,double b=0,double h=0):Base(h){l=a;w=b;}void disp(){cout<<"长方体："<<endl;cout<<"长："<<l<<"\t宽："<<w<<"\t高："<<h<<endl;cout<<"长方体的体积="<<w*l*h<<endl;}};class Cylinder:public Base    //定义圆柱体派生类{private:double r;public:Cylinder(double c=0,double h1=0):Base(h1){r=c;}void disp(){cout<<"圆柱体："<<endl;cout<<"半径："<<r<<"\t高："<<h<<endl;cout<<"圆柱体的体积="<<r*r*h*3.14<<endl;}};int main(){Base *pc;Cuboid Cu(6,8,20);Cylinder Cy(3,7);pc=&Cu;pc->disp();pc=&Cy;pc->disp();return 0;}

编译过程中出现error C2248: 'h' : cannot access private member declared in class 'Base的错误提醒，原因是把基类中的保护成员写成了私有成员，导致派生类无法访问成员中的数据。这是由于自己对类的继承方式的不熟练，在翻阅书本后，现已改正编译错误，成功运行。

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