题目内容

有如下程序:#include using namespace std;class Base{public:void fun1() { cout<<"Base\n"; }virtual void fun2() { cout<<"Base\n"; }};class Derived : public Base {public:void fun1() { cout<<"Derived\n"; }void fun2() { cout<<"Derived\n"; }};void f(Base& b) { b.fun1(); b.fun2(); }int main(){Derived obj;f(obj);return 0;}执行这个程序的输出结果是()。

A. Base Base
Base Derived
C. Derived Base
Derived Derived

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有如下程序:#include using namespace std;class Base {public:void output() { cout<<1; }virtual void Print() { cout<<′B′; }};class Derived : public Base {public:void output() { cout<<2; }void Print() { cout<<′D′; }};int main(){Base *ptr=new Derived;ptr->output();ptr->Print();delete ptr;return 0;}执行这个程序的输出结果是()。

A. 1B
B. 1D
C. 2B
D. 2D

在一个有向图中,所有顶点的入度和等于所有结点的出度之和的()倍。

A. 1/2
B. 1
C. 2
D. 3

一个图的边集为{,,,,,},从顶点a出发进行深度优先遍历搜索得到的顶点序列为【】,从顶点a出发进行广度优先搜索遍历得到的顶点序列为【】。(答案不唯一)acefbd

对有n个顶点的无向图,其边数e与各顶点度数间满足下列等式e= ∑ni-1TD(Vi)。( )

A. 对
B. 错

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