C++ | Inheritance | Question 13

#include<iostream>
using namespace std;

class Base1
{
public:
    char c;
};

class Base2
{
public:
    int c;
};

class Derived: public Base1, public Base2
{
public:
    void show()  { cout << c; }
};

int main(void)
{
    Derived d;
    d.show();
    return 0;
}

(A) Compiler Error in “cout << c;"
(B) Garbage Value
(C) Compiler Error in “class Derived: public Base1, public Base2”


Answer: (A)

Explanation: The variable ‘c’ is present in both super classes of Derived. So the access to ‘c’ is ambiguous. The ambiguity can be removed by using scope resolution operator.

#include<iostream>
using namespace std;

class Base1
{
public:
    char c;
};

class Base2
{
public:
    int c;
};

class Derived: public Base1, public Base2
{
public:
    void show()  { cout << Base2::c; }
};

int main(void)
{
    Derived d;
    d.show();
    return 0;
}

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