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7.4作业题解答

一、选择填空

二、判断下列描述的正确性，对者划√，错者划╳。

三、

1、解答：

1）上述结构的DAG图如下所示。无二异性

2）无二异性

3）无二异性

2、

1）无

2）无

3）有

4）无

5）有

四、

1、运行该程序后输出结果如下：

（1,2）

5,6

（6,9）

2、运行该程序后输出结果如下：

（1,2）

（6,9）

5,6

（6,9）

3、运行该程序后输出结果如下：（13,22,30,40）

4.、运行该程序后输出结果如下：

D2::display()

Pri1=4,pri2=5

Pri4=6

Pri2=7

D2::display()

Pri1=12,pri2=9

Pri4=7

Pri2=8

五、分析

该程序与前一个程序的区别仅表现出以下两点。

1）采用了虚基类，D1类和D2类的基类为虚基类。

2）类D12的构造函数中，不近包含了它的两个基类的构造函数，而且包含了虚基类P的构造函数。

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