Aankhen Technology Interview Questions, Process, and Tips

First Round was Mixture of C and Basic aptitude question

Q1. What do you mean by virtual Destructor.
Ans. 
A virtual destructor is a destructor declared as virtual in a base class to ensure proper destruction of derived class objects.
• Virtual destructors are used in polymorphic base classes to ensure that the destructor of the derived class is called when deleting a base class pointer.

• They allow proper cleanup of resources allocated in the derived class.

• Example: class Base { virtual ~Base() {} }; class Derived : public Base ...read more
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Q2. Write a program to find number of bits in a number.
Ans. 
Program to find number of bits in a number
• Use bitwise operations to count the number of bits in a number

• Iterate through each bit and count the set bits

• Use log base 2 to find the number of bits in a number
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Q3. What do you mean by copy constructor
Ans. 
A copy constructor is a special type of constructor in C++ that creates a new object as a copy of an existing object.
• Copy constructor is used to initialize a new object as a copy of an existing object.

• It is invoked when an object is passed by value, returned by value, or explicitly called.

• Example: class MyClass { public: MyClass(const MyClass& obj) { // copy constructor logic } };

• Example: MyClass obj1; MyClass obj2 = o...read more
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Q4. What is static variable
Ans. 
Static variable is a variable that retains its value between function calls.
• Static variables are declared using the 'static' keyword.

• They are initialized only once and retain their value throughout the program execution.

• They have a local scope within the function where they are declared.

• Example: static int count = 0; // retains its value between function calls
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Q5. Write a program to add two linked list.
Ans. 
Program to add two linked lists
• Create a function that takes two linked lists as input

• Traverse both lists simultaneously and add corresponding nodes

• Handle cases where one list is longer than the other
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