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若有以下程序:#include<iostream>using namespace std;class A {private: int x;public: int z; void setx(int i) { x=i; } int getx () { return x; }}:class B : public A{private: int m;public: int p; void setvalue(int a, int b, int c) { setx(a) ; z=b; m=c; } void display{) { cout<<getx ()<<", "<<z<<", "<<m<<end1; }};int main(){ B obj; obj. setvalue(2,3,4); obj.display(); return 0;} 程序运行以后的输出结果是

单选题
2023-11-08 15:12
A、产生语法错误
B、2,3,4
C、2,2,2
D、4,3,2
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正确答案
B

试题解析
解析:本题考核继承与派生。当类的继承方式为公有继承时,基类的公有成员和保护成员分别作为派生类的公有成员和保护成员,派生类的其他成员可以直接访问它们。其他外部使用者只能通过派生类的对象访问继承来的公有成员。在本题中,数据成员z和函数setx都是基类A的公有成员,它们经过公有继承以后,在派生类B中还是公有成员,而派生类B中的函数setvalue和display都是公有成员,可以通过对象对它们进行访问。所以程序中对各成员的访问是正确的。本程序的功能是输出已设置的各成员的值。

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