LG Soft India Interview Questions, Process, and Tips

Basic C++ questions , Threading design patterns
Functors
Std:: function
Std::move and modern c++ features
Moving a threading
Vectors
Smart pointers
Design a smart pointers
Design a vector

Q1. Design patterns singleton factory observer Threading Strong problems like palindrome C++ output problems Recursive functions Linkedlist
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Q2. Write Singleton pattern which is thread safe
Ans. 
A thread-safe implementation of the Singleton pattern ensures that only one instance of a class is created in a multi-threaded environment.
• Use double-checked locking to minimize the use of synchronization and improve performance.

• Declare the instance variable as volatile to ensure visibility across threads.

• Use synchronized block to create the instance if it doesn't exist.

• Return the instance variable in the getInstance()
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Q3. Observer design pattern sample program
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Q4. What is a functor and when is it used
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A functor is an object that can be treated as a function or a function pointer. It is used to encapsulate a function or a callable object.
• Functors are often used in C++ to implement function objects.

• They can be used as arguments to algorithms or as template parameters.

• Functors provide a way to customize behavior in generic programming.

• They can be used to define custom comparison functions for sorting or searching.

• Examp...read more
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Q5. What is OOPS ?
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OOPS stands for Object-Oriented Programming System. It is a programming paradigm that uses objects to represent and manipulate data.
• OOPS is a programming paradigm that focuses on the concept of objects.

• It allows for the creation of reusable and modular code.

• Objects have properties (attributes) and behaviors (methods).

• Encapsulation, inheritance, and polymorphism are key principles of OOPS.

• Example: In a banking system, a...read more
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Q1. Difference b/w List and Tuple? what is class and self? Inheritance related questions? Garbage Collector? OOPS Related Questions? etc..
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Q2. Reverse the string without using slicing method? Missing numbers in the list? Ascending order of list without using sorting method?
Ans. 
Reverse string without slicing, find missing numbers, sort list without sorting method
• To reverse a string without slicing, you can use a loop to iterate through the characters and build a new string in reverse order.

• To find missing numbers in a list, you can iterate through the list and check for gaps between consecutive numbers.

• To sort a list in ascending order without using sorting method, you can implement a sorting
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Python related Questions?
Find the Prime numbers Using Java script?
Multiple Inheritance code and explanation?
etc..
Some Linux related questions like
What are commands to create files?
Grep command?
etc..

Aptitude test consist of 25-30 questions (I don’t remember exactly) and most of all questions are related to software testing

Q1. 1.What is Test Plan?
Ans. 
A test plan is a document that outlines the scope, approach, resources, and schedule of testing activities.
• Test plan defines the testing activities to be performed, such as test objectives, test strategies, and test deliverables.

• It includes details on the test environment, test tools, test data, and risks.

• Test plan also specifies the roles and responsibilities of team members involved in testing.

• It serves as a guide fo...read more
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Q2. 2.Test Secnario & Test Cases (Diff & Definition)
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Q3. 3.Types of Testing
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Types of testing include functional testing, non-functional testing, manual testing, automated testing, and more.
• Functional Testing: Testing the functionality of the software against the requirements.

• Non-Functional Testing: Testing aspects like performance, usability, security, etc.

• Manual Testing: Testing done manually by testers without the use of automation tools.

• Automated Testing: Testing done using automation tools...read more
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Q4. 4.Agile methodology
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1 hour, Basic DSA technical MCQ's

Q1. Questions about Dynamic Allocation
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Q2. Questions about Java OOPS
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Q1. Explain about C++ concepts
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C++ concepts include object-oriented programming, classes, inheritance, polymorphism, templates, and memory management.
• Object-oriented programming is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.

• Classes are user-defined data types that contain data members and member functions.

• Inheritance allows a class to inherit properties and ...read more
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Q2. Explain about the smart pointers

Ans. 

Smart pointers are objects that manage the memory of dynamically allocated objects in C++ to prevent memory leaks.

• Smart pointers automatically handle memory deallocation

• Types of smart pointers include unique_ptr, shared_ptr, and weak_ptr

• Example: unique_ptr ptr(new int(5));

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