内蒙古科技大学面向对象的程序设计实验9 继承(二)

1、内蒙古科技大学面向对象的程序设计实验报告课程名称：面向对象的程序设计姓名：陈伟光实验名称：继承(二)学号：任课教师：刘月峰专业：软件工程指导教师：刘月峰班级：15-软件一班一、实验目的1理解多重派生的定义；2理解多重派生中构造函数与析构函数的调用顺序；3理解多重派生中虚拟基类的作用；二、实验环境编译器：Visual C+ 6.0.操作系统：Windows 7旗舰版三、实验内容2.1练习（一）：1理解下面的程序，并在VC+6.0下运行查看结果，回答程序后面的问题。class CBase1public:CBase1(int a) :a(a) coutbase1 structure.endl;CBa

2、se1() coutbase1 destructure.endl;void print() couta=aendl;protected:int a;class CBase2public:CBase2(int b) :b(b) coutbase2 structure.endl;CBase2() coutbase2 destructure.endl;void print() coutb=bendl;protected:int b;class CDerive : public CBase1, public CBase2public:CDerive() coutderive structure.end

3、l;CDerive() coutderive destructure.endl;void print() CBase1:print(); CBase2:print(); b1.print(); b2.print(); coutc=cendl;private:CBase1 b1;CBase2 b2;int c;void main()CDerive d;d.print();问题一：改正以上程序中存在的错误，并分析该程序的输出结果。2理解下面的程序，并在VC+6.0下运行查看结果，回答程序后面的问题。#include iostream.hclass CBasepublic:CBase(int a)

4、:a(a)int a;class CDerive1 : public CBasepublic:CDerive1(int a) :CBase(a);class CDerive2 : public CBasepublic:CDerive2(int a) :CBase(a);class CDerive : public CDerive1,public CDerive2public:CDerive(int a,int b) :CDerive1(a),CDerive2(b);void main()CDerive d(1,2);coutd.aendl;问题一：在不改变原有程序意图的前提下，改正以上程序，并

5、使程序正确输出。四、实验过程练习1实验题目提供源代码如下:尝试编译结果如下:分析错误原因,是派生类继承两个基类的数据以及内嵌两个子对象的数据没有正确的构造,这里加上正确的形参表和初始化列表修改之后的代码如下:加上之后,再次尝试编译结果如下:运行结果如下:练习 2题目源代码如下:编译结果如下:代码显示无法分辨a的来源,导致了二义性问题,此处为不更改题目条件,所以采取虚基类方式修改修改代码如下:再次运行结果如下:CBase(a)时CBase(b)时五、实验总结实验源代码:练习（一）#include class CBase1public:CBase1(int a):a(a)coutbase1 str

6、ucture.endl;CBase1()coutbase1 destructure.endl;void print()couta=aendl;protected:int a;class CBase2public:CBase2(int b):b(b)coutbase2 structure.endl;CBase2()coutbase2 destructure.endl;void print()coutb=bendl;protected:int b;class CDerive : public CBase1, public CBase2public:CDerive(int a=0,int b=0,i

7、nt aa=0,int bb=0,int c1=0):CBase1(a),CBase2(b),b1(aa),b2(bb),c(c1)coutderive structure.endl; /派生类构造函数无法完成继承来的基类数据初始化CDerive()coutderive destructure.endl;void print()CBase1:print();CBase2:print();b1.print();b2.print();coutc=cendl;private:CBase1 b1;CBase2 b2;int c;void main()CDerive d;d.print();/*#inc

8、lude class CBase1public:CBase1(int a):a(a)coutbase1 structure.endl;CBase1()coutbase1 destructure.endl;void print()couta=aendl;protected:int a;class CBase2public:CBase2(int b):b(b)coutbase2 structure.endl;CBase2()coutbase2 destructure.endl;void print()coutb=bendl;protected:int b;class CDerive : publi

9、c CBase1, public CBase2public:CDerive()coutderive structure.endl;CDerive()coutderive destructure.endl;void print()CBase1:print();CBase2:print();b1.print();b2.print();coutc=cendl;private:CBase1 b1;CBase2 b2;int c;void main()CDerive d;d.print();*/练习（二）#include iostream.hclass CBasepublic:CBase(int a):a(a)int a;class CDerive1 :virtual public CBasepublic:CDerive1(int a):CBase(a);class CDerive2 :virtual public CBasepublic:CDerive2(int a):CBase(a);class CDerive : pub