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单选题 A protected member is ( ) in the derived class
学科：C++语言程序设计
时间：2025-06-14 05:35:19
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题目1单选题
Object-oriented programming allows you to derive new classes from existing classes. This is called ( )A. encapsulationB. inheritanceC. abstractionD. generalization
题目2单选题
In inheritance, the more specific class is called the ( ) classA. baseB. derivedC. superclassD. none of the above
题目3单选题
A protected member is ( ) in the derived classA. visibleB. not visibleC. hiddenD. neither A nor B nor c
题目4单选题
In public inheritance, a private data member in the base class becomes ( ) in the derived classA. privateB. protectedC. publicD. inaccessible
题目5单选题
In class MyDERIVED, the number of protected members is ( )class MyBASE {private: int k;public: void set(int n) { k = n; } int get( ) const { return k; }};class MyDERIVED : protected MyBASE {protected: int j;public: void set(int m, int n) { MyBASE::set(m); j = n; } int get( ) const { return MyBASE::get( ) + j; }}A. 4B. 3C. 2D. 1
题目6单选题
Given the following program:#include <iostream>using namespace std;class Base {private: void fun1( ) const { cout << "fun1"; }protected: void fun2 ( ) const { cout << "fun2"; }public: void fun3 ( ) const { cout << "fun3"; }};class Derived : protected Base {public: void fun4( ) const { cout << "fun4"; }};int main( ) { Derived obj; obj.fun1( ); // (1) obj.fun2( ); // (2) obj.fun3( ); // (3) obj.fun4( ); // (4) return 0;}Which lines followed with comment is not correctA. (1)(2)(3)(4)B. (1)(2)(3)C. (2)(3)(4)D. (1)(4)
题目7单选题
Given the following program:#include <iostream>using namespace std;class Base {public: void fun ( ) { cout << "Base::fun" << endl; }};class Derived : public Base {public: void fun( ) { __________; cout << "Derived::fun" << endl; }};int main( ) { Derived d; d.fun( ); return 0;}After compiling and executing, it displays:Base::funDerived::funThen, the statement should be filled in underline is ( )A. Base.fun( )B. Base::fun( )C. Base->fun( )D. fun( )
题目8单选题
What will be displayed by the following program?#include <iostream>using namespace std;class C {public: string toString( ) { return "C"; }};class B: public C { string toString( ) { return "B"; }};class A: public B { string toString( ) { return "A"; }}; void displayObject(C *p) { cout << p->toString( );} int main( ) { A a; B b; C c; displayObject(&a); displayObject(&b); displayObject(&c); return 0;}A. ABCB. CBAC. AAAD. BBBE. CCC
题目9单选题
Which of the following is not correct ( )A. In practice, public inheritance mode is used more frequentlyB. In derived class, the members inherited from base class must be unambiguousC. The type compatibility rules is also suitable to multi-inheritanceD. The public members of the base class remain public in derived class
题目10单选题
The incorrect statement regarding the relationship between derived class objects and base class objects in the case of public inheritance mode is ( )A. Derived class objects can be assigned to base class objectsB. Derived class objects can initialize base class referencesC. Derived class objects can directly access the members inherited from their base classesD. The address of a derived class object can be assigned to a pointer with base class type
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