What is the output of the following code?
class A {
public:
A() { cout << "A "; }
~A() { cout << "~A "; }
};
class B : public A {
public:
B() { cout << "B "; }
~B() { cout << "~B "; }
};
int main() {
B obj;
return 0;
}
Q.2Hard
Consider the following code:
class Base {
protected:
int x = 10;
};
class Derived : private Base {
public:
void display() { cout << x; }
};
int main() {
Derived d;
d.display();
}
Q.3Hard
What is the output of operator overloading in the following context?
class Complex {
public:
int real, imag;
Complex operator+(const Complex &c) {
Complex temp;
temp.real = real + c.real;
temp.imag = imag + c.imag;
return temp;
}
};
Complex c1, c2, c3;
c1 = {1, 2}; c2 = {3, 4};
c3 = c1 + c2;
Q.4Hard
Consider the following code:
class A { public: virtual ~A() {} };
class B : public A { public: ~B() {} };
int main() { A* ptr = new B(); delete ptr; }
What is the significance of virtual destructor here?
Q.5Hard
How is the Diamond Problem solved in C++ using virtual inheritance?
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Q.6Hard
Which of the following is NOT a characteristic of a good object-oriented design?
Q.7Hard
Which of the following best describes the Liskov Substitution Principle (LSP)?
Q.8Hard
What is the difference between shallow copy and deep copy in C++?
Q.9Hard
What is a virtual destructor and why is it important?
Q.10Hard
In C++, what does the 'mutable' keyword do when applied to a class member?
Q.11Hard
What is the primary advantage of using interfaces (abstract classes with pure virtual functions) in C++?
Q.12Hard
What happens when you try to delete a derived class object through a base class pointer without a virtual destructor?
Q.13Hard
Consider the code: class A { int x; }; class B : private A { }; class C : public B { };
Can class C access x?
Q.14Hard
In C++, what is the result of dynamic_cast when it fails on a pointer?
Q.15Hard
What will be printed by this code?
class A { public: virtual void print() { cout << "A"; } };
class B : public A { public: void print() { cout << "B"; } };
int main() { A *arr[2]; arr[0] = new A(); arr[1] = new B(); arr[0]->print(); arr[1]->print(); }
Q.16Hard
In a multiple inheritance scenario with diamond problem, how does C++ resolve ambiguity?
Q.17Hard
Consider a scenario where class C inherits from both class A and class B, and both A and B have a method foo(). Which statement correctly resolves the ambiguity?
Q.18Hard
What is the relationship between references and pointers in C++ OOP context?
Q.19Hard
Consider the following code: class A { public: virtual ~A() {} }; class B : public A {}; int main() { A *ptr = new B(); delete ptr; }. What does the virtual destructor ensure?
Q.20Hard
What is the key difference between shallow copy and deep copy in the context of copy constructors?
