b_9_2.cpp

C++应用教程原码,里面包含该书中有十三章内容的代码,详细具体

#include "stdafx.h"
#include <iostream>
#include <string>
#include<iomanip>
using namespace std;

class A {
public:
	int va;
	A() {va = 0;}
	A(int i){va=i;}
	virtual A& operator+(A& t)
	{	static A temp(0);
	    temp.va = va + t.getval();
	    return temp;
    }
	virtual A& operator=(A& t)
	{	va=t.getval();
	    return *this;
    }
	virtual int getval(){return va;}
	void disp(){cout<<"va="<<va<<endl;}
};
class B:public A {
public:
	int vb;
	B() {vb = 0;}
	B(int i){vb=i;}
	virtual A& operator+(A& t)
    {   static B temp(0);
	    temp.vb = vb + t.getval();
    	return temp;
    }
	virtual A& operator=(A& t)
    {	vb=t.getval();
	    return *this;
    }
	virtual int getval(){ return vb;}
	void disp(){cout<<"vb="<<vb<<endl;}
};
class C:public B {
public:
	int vc;
	C() { vc = 0;}
	C(int i){vc=i;}
	virtual A& operator+(A& t)
	{	static C temp(0);
	    temp.vc = vc + t.getval();
	    return temp;
    }
	virtual A& operator=(A& t)
	{	vc=t.getval();
	    return *this;
    }
	virtual int getval(){return vc;}
	void disp(){cout<<"vc="<<vc<<endl;}
};
void main()
{	A a(10);
	B b(20);
	C c(60);
	a=b+c;
	c=b+a;
	a.disp();
	b.disp();
	c.disp();
	cin.get(); //等待结束，以便调测程序，可以删除
}