[数据结构与算法]虚基类的实现_C++

虚基类的实现

// 
题目描述
main（）函数已经写好，需要完善类的定义。


基类：base，base的子类：base01(实现变量+10），base02（实现变量+20）， Derived 继承自：base01，base02。

参考教材：P172 修改代码。


需要借助：虚基类实现。


int  main()
{
    int ival = 0;
    cin >> ival;

    Derived obj(ival);
    return 0;
}
输入
5
输出
base=5
in base01(), m_a = 15
in base02(), m_a = 35
base01::m_a = 35
base02::m_a = 35
样例输入 Copy
10
样例输出 Copy
Base=10
in Base01(), m_a = 20
in Base02(), m_a = 40
Base01::m_a = 40
Base02::m_a = 40

// 
#include <iostream>

using namespace std;
class Base {
public:
    Base(int a) {
        m_a = a;
        cout << "Base=" << m_a <<endl;
    }
    int m_a;
};
class Base01 :virtual public Base {
public:
    Base01(int a):Base(a) {
        m_a = m_a + 10;
        cout << "in Base01(), m_a = " << m_a << endl;
    }
};
class Base02 :virtual public Base {
public:
    Base02(int a) :Base(a) {
        m_a = m_a + 20;
        cout << "in Base02(), m_a = " << m_a << endl;
    }
};
class Derived :public Base01, public Base02 {
public:
    Derived(int a) :Base(a), Base01(a), Base02(a) {
        cout << "Base01::m_a = " << Base01::m_a << endl;
        cout << "Base02::m_a = " << Base02::m_a << endl;

    }
};