C++ | Virtual Functions | Question 6

Predict the output of following program.

#include<iostream>
using namespace std;
class Base
{
public:
    virtual void show() = 0;
};

class Derived : public Base { };

int main(void)
{
    Derived q;
    return 0;
}

(A) Compiler Error: there cannot be an empty derived class
(B) Compiler Error: Derived is abstract
(C) No compiler Error

Answer: (B)
Explanation: If we don’t override the pure virtual function in derived class, then derived class also becomes abstract class.

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