GS Lab Interview Questions, Process, and Tips

Software reengineering is the process of modifying and improving existing software systems.

• It involves analyzing the existing software system and identifying areas for improvement.

• The goal is to enhance the system's functionality, performance, and maintainability.

• Reengineering can involve reverse engineering, restructuring, and forward engineering.

• Examples include updating legacy systems, migrating to new platforms, an

Agile is the best software model due to its flexibility and adaptability.

• Agile allows for continuous feedback and improvement

• It prioritizes customer satisfaction and collaboration

• It is adaptable to changing requirements and needs

• Examples include Scrum, Kanban, and Extreme Programming

TCP/IP model is a networking protocol used for communication between devices on the internet.

• TCP/IP model stands for Transmission Control Protocol/Internet Protocol model.

• It consists of four layers: Application, Transport, Internet, and Network Access.

• Each layer has its own set of protocols and functions.

• The Application layer deals with user interfaces and data exchange.

• The Transport layer ensures reliable data transfe...read more

My favorite OOPS concept is inheritance.

• Inheritance allows a class to inherit properties and methods from another class.

• It promotes code reusability and saves time and effort in coding.

• There are different types of inheritance such as single, multiple, multilevel, and hierarchical.

• For example, a class 'Car' can inherit properties and methods from a class 'Vehicle'.

Program to find loop in linked list and starting node of the loop

• Use Floyd's cycle detection algorithm to find the loop

• Once loop is detected, use two pointers to find the starting node of the loop

• One pointer starts from the head and the other starts from the meeting point of the two pointers in the loop

• Move both pointers one node at a time until they meet again, which is the starting node of the loop

Program to convert case and swap digits in a string

• Use a loop to iterate through each character in the string

• Check if the character is a letter or a digit

• If it's a letter, use the built-in functions to convert case

• If it's a digit, swap it with the adjacent digit using a temporary variable

SQL query to list in descending order by country name and ascending order by date.

• Use ORDER BY clause with two columns, one in descending order and the other in ascending order

• Syntax: SELECT column1, column2 FROM table_name ORDER BY column1 DESC, column2 ASC

• Example: SELECT name, date FROM table_name ORDER BY name DESC, date ASC

Program to convert binary to decimal values

• Take input as binary string

• Iterate over each digit and multiply with 2 raised to power of position

• Add all the values obtained in previous step to get decimal value

Program to find non common characters in two strings

• Iterate through each character in both strings

• Compare each character and add non-common characters to a new string

• Return the new string with non-common characters