假设有如下三个基类的定义： class Base1{ int a,b,c; public: void initBase1(int a,int b,int c){ this->a=a; this->b=b; this->c=c; } int getA()const{ return a; } int getB()const{ return b; } protected: int getC()const{ return c; } }; class Base2{ int x,y,z; public: void initBase2(int x,int y,int z){ this->x=x; this->y=y; this->z=z; } int getX()const{ return x; } int getY()const{ return y; } int getZ()const{ return z; } }; class Base3{ protected: int i,j,k; void initBase3(int i,int j,int k){ this->i=i; this->j=j; this->k=k; } private: int getI()const{ return i; } int getJ()const{ return j; } int getK()const{ return k; } }; 并且有派生类的定义的第一行： class Derived:public Base2,private Base3,protected Base1 main函数已经写好了，请根据基类的定义和main函数的定义，结合输入输出，完成Derived类的定义： int main(){ int a,b,c; int x,y,z; int i,j,k; cin>>a>>b>>c; cin>>x>>y>>z; cin>>i>>j>>k; Derived d; d.initBase1(a,b,c); d.initBase2(x,y,z); d.initBase3(i,j,k); cout<<d.getA()<<" "<<d.getB()<<" "<<d.getC()<<endl; cout<<d.getX()<<" "<<d.getY()<<" "<<d.getZ()<<endl; cout<<d.getI()<<" "<<d.getJ()<<" "<<d.getK()<<endl; return 0; } 输入描述输入9个整数输出描述输出三行数据，每行三个整数提示​你只需要提交Derived类的类体花括号内部的代码，Derived类定义的第一行和类体的花括号不需要提交样例输入 复制 更多样例输出

class Derived : public Base2, private Base3, protected Base1 {
public:
    void initDerived(int a, int b, int c, int x, int y, int z, int i, int j, int k) {
        initBase1(a, b, c);
        initBase2(x, y, z);
        initBase3(i, j, k);
    }
    using Base1::getA;
    using Base1::getB;
    using Base1::getC;
    using Base2::getX;
    using Base2::getY;
    using Base2::getZ;
    using Base3::getI;
    using Base3::getJ;
    using Base3::getK;
};

相关问题

​假设有如下三个基类的定义： class Base1{ int a,b,c; public: void initBase1(int a,int b,int c){ this->a=a; this->b=b; this->c=c; } int getA()const{ return a; } int getB()const{ return b; } protected: int getC()const{ return c; } }; class Base2{ int x,y,z; public: void initBase2(int x,int y,int z){ this->x=x; this->y=y; this->z=z; } int getX()const{ return x; } int getY()const{ return y; } int getZ()const{ return z; } }; class Base3{ protected: int i,j,k; void initBase3(int i,int j,int k){ this->i=i; this->j=j; this->k=k; } private: int getI()const{ return i; } int getJ()const{ return j; } int getK()const{ return k; } }; 并且有派生类的定义的第一行： class Derived:public Base2,private Base3,protected Base1 main函数已经写好了，请根据基类的定义和main函数的定义，结合输入输出，完成Derived类的定义： int main(){ int a,b,c; int x,y,z; int i,j,k; cin>>a>>b>>c; cin>>x>>y>>z; cin>>i>>j>>k; Derived d; d.initBase1(a,b,c); d.initBase2(x,y,z); d.initBase3(i,j,k); cout<<d.getA()<<" "<<d.getB()<<" "<<d.getC()<<endl; cout<<d.getX()<<" "<<d.getY()<<" "<<d.getZ()<<endl; cout<<d.getI()<<" "<<d.getJ()<<" "<<d.getK()<<endl; return 0; }

根据输入输出和三个基类的定义，我们可以完成Derived类的定义：

class Derived : public Base2, private Base3, protected Base1 {
public:
    void initDerived(int a, int b, int c, int x, int y, int z, int i, int j, int k) {
        initBase1(a, b, c);
        initBase2(x, y, z);
        initBase3(i, j, k);
    }
    int getA() const { return Base1::getA(); }
    int getB() const { return Base1::getB(); }
    int getC() const { return Base1::getC(); }
    int getX() const { return Base2::getX(); }
    int getY() const { return Base2::getY(); }
    int getZ() const { return Base2::getZ(); }
    // Base3中的成员函数是private的，无法在Derived中访问
};

在main函数中，我们可以这样使用Derived类：

int main() {
    int a, b, c;
    int x, y, z;
    int i, j, k;
    cin >> a >> b >> c;
    cin >> x >> y >> z;
    cin >> i >> j >> k;
    Derived d;
    d.initDerived(a, b, c, x, y, z, i, j, k);
    cout << d.getA() << " " << d.getB() << " " << d.getC() << endl;
    cout << d.getX() << " " << d.getY() << " " << d.getZ() << endl;
    // Base3中的成员函数是private的，无法在Derived中访问
    return 0;
}

指出下面程序错误，并修改运行。 class A{ public: void setA(int); void showA(); private: int a; }; class B{ public: void setB(int); void showB(); private: int b; }; class C : public A, private B{ public: void setC(int, int, int); void showC(); private: int c; }; void A::setA(int x) { a=x; } void B::setB(int x) { b=x; } void C::setC(int x, int y, int z) { //派生类成员直接访问基类的 //公有成员 setA(x); setB(y); c=z; } void A::showA() { cout<<a<<endl; } void B::showB() { cout<<b<<endl; } void C::showC() { A::showA();B::showB();cout<<c<<endl;} int main() { C obj; obj.setA(5); obj.showA(); obj.setC(6,7,9); obj.showC(); obj.setB(6); obj.showB(); return 0; }

程序的问题在于在main函数中直接调用了C类的私有继承自B类的成员函数setB()和showB()，应该改为在C类中增加公有成员函数来访问B类的私有成员函数。以下是修改后的程序：

#include <iostream>
using namespace std;

class A{
public:
    void setA(int);
    void showA();
private:
    int a;
};

class B{
public:
    void setB(int);
    void showB();
private:
    int b;
};

class C : public A, private B{
public:
    void setC(int, int, int);
    void showC();
    void setB_public(int x) { setB(x); }
    void showB_public() { showB(); }
private:
    int c;
};

void A::setA(int x) { a = x; }
void B::setB(int x) { b = x; }
void C::setC(int x, int y, int z) {
    setA(x);
    setB(y);
    c = z;
}

void A::showA() { cout << a << endl; }
void B::showB() { cout << b << endl; }
void C::showC() { A::showA(); B::showB(); cout << c << endl; }

int main() {
    C obj;
    obj.setA(5);
    obj.showA();
    obj.setC(6, 7, 9);
    obj.showC();
    obj.setB_public(6);
    obj.showB_public();
    return 0;
}

在C类中增加了公有成员函数setB_public()和showB_public()来访问B类的私有成员函数，然后在main函数中通过这两个函数来调用B类的成员函数。