20+ Blue Star Interview Questions and Answers

There are 5 types of inheritance: single, multiple, multilevel, hierarchical, and hybrid.

• Single inheritance: A class inherits from a single base class.

• Multiple inheritance: A class inherits from multiple base classes.

• Multilevel inheritance: A class inherits from a derived class, which in turn inherits from another class.

• Hierarchical inheritance: Multiple classes inherit from a single base class.

• Hybrid inheritance: Combination of multiple and multilevel inheritance.

Reverses the order of elements in an array stored in a linked list.

• Traverse the linked list and store the elements in an array

• Reverse the array using two pointers

• Update the linked list with the reversed array

Code implementing inheritance

• Inheritance is a concept in object-oriented programming where a class inherits properties and methods from another class

• The class that is being inherited from is called the parent class or base class

• The class that inherits from the parent class is called the child class or derived class

• The child class can access the properties and methods of the parent class

• Inheritance promotes code reusability and allows for creating specialized classes based on ...read more

Iterative solution to perform preorder traversal without using recursion

• Use a stack to keep track of nodes

• Start by pushing the root node onto the stack

• While the stack is not empty, pop a node, visit it, then push its right child followed by its left child onto the stack

4 pillars of OOPs are Abstraction, Encapsulation, Inheritance, and Polymorphism. TCP/IP and OSI models are networking models.

• Abstraction: Hiding implementation details and showing only necessary information.

• Encapsulation: Binding data and functions together and restricting access to them.

• Inheritance: Creating new classes from existing ones, inheriting their properties and methods.

• Polymorphism: Ability of objects to take on multiple forms or behaviors.

• TCP/IP model: Consists of...read more

Malware is a broad term that includes viruses, which are a specific type of malware. Python code can be used to identify IP addresses in malware analysis.

• Malware is a general term for any type of malicious software, while viruses are a specific type of malware that self-replicates by inserting copies of itself into other computer programs.

• Python code can be used to extract and analyze IP addresses from malware samples, helping analysts understand the network infrastructure us...read more

To rotate a matrix 90 degrees, transpose the matrix and then reverse each row.

• Transpose the matrix by swapping matrix[i][j] with matrix[j][i]

• Reverse each row of the transposed matrix to get the final rotated matrix

Diamond problem is a common issue in multiple inheritance where a class inherits from two classes that have a common ancestor.

• Occurs in languages that support multiple inheritance like C++

• Results in ambiguity when calling methods or accessing attributes from the common ancestor class

• Can be resolved using virtual inheritance or interfaces

Run length encoding is a data compression technique that replaces repeated characters with a count and single character.

• Iterate through the input array of strings

• Count the number of consecutive characters in each string

• Replace consecutive characters with count and character

Rotate an array of strings by d times

• Create a new array and copy elements from original array based on rotation index

• Use modulo operator to handle cases where d is greater than array length

• Handle edge cases like empty array or d being negative