Nihilent Software Engineer Trainee Interview Questions and Answers

Swap 2 integers without using 3rd integer

• Use XOR operator

• Addition and subtraction can also be used

• Bitwise operations can be used

Keys and joins are important concepts in DBMS.

• Keys are used to uniquely identify a record in a table.

• Primary key is a unique identifier for a table.

• Foreign key is a reference to a primary key in another table.

• Joins are used to combine data from two or more tables based on a related column.

• Inner join returns only the matching records from both tables.

• Left join returns all records from the left table and matching records from the right table.

• Right join returns all records from ...read more

Primary key uniquely identifies a record in a table, while foreign key establishes a link between two tables.

• Primary key is unique and cannot have null values

• Foreign key references the primary key of another table

• Primary key can be used to enforce entity integrity

• Foreign key can be used to enforce referential integrity

Monkey patching is a technique in programming where existing code is changed or extended at runtime.

• Monkey patching is commonly used in dynamic languages like Python and Ruby.

• It involves modifying or adding new methods to existing classes or modules.

• Monkey patching can be useful for fixing bugs or adding new functionality without modifying the original source code.

OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.

• OOPs focuses on creating objects that interact with each other to solve a problem

• Key concepts include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation involves bundling data and methods that operate on the data into a single unit

• Inheritance allows a class to inherit properties and behavior from another class

• Polymorphism allows obj...read more