Polymorphism Interview Questions

What does polymorphism mean in C++?

Which of the following supports compile-time polymorphism?

What will the following code output?

#include<iostream>
using namespace std;
void show(int x) { cout << "Int"; }
void show(double y) { cout << "Double"; }
int main() {
    show(5.5);
}

Which operator cannot be overloaded in C++?

What will this code print?

#include<iostream>
using namespace std;
class Base {
public: virtual void show() { cout << "Base"; } };
class Derived : public Base {
public: void show() { cout << "Derived"; } };
int main() {
    Base* b = new Derived();
    b->show();
}

What happens if `virtual` is removed in the above code?

How do we declare a pure virtual function?

What will be the output?

#include<iostream>
using namespace std;
class Shape {
public: virtual void draw() = 0; };
class Circle : public Shape {
public: void draw() { cout << "Circle"; } };
int main() {
    Circle c; c.draw();
}

What will this print?

#include<iostream>
using namespace std;
class A { public: virtual void show(){ cout<<"A"; } };
class B: public A { public: void show(){ cout<<"B"; } };
int main(){
    B obj; obj.show();
}

What is the output?

#include<iostream>
using namespace std;
class Animal {
public: virtual void sound() { cout << "Animal"; } };
class Dog : public Animal {
public: void sound() { cout << "Dog"; } };
int main() {
    Animal* a = new Dog();
    a->sound();
}