LG Soft India Interview Questions and Answers for Experienced

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
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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()...read more
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Q3. Observer design pattern sample program
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The Observer pattern allows objects to subscribe and receive updates from a subject when its state changes.
• Decouples the subject from its observers, promoting loose coupling.

• Useful in event-driven systems, like GUI applications.

• Example: A news agency (subject) notifies subscribers (observers) about breaking news.

• Supports multiple observers, allowing for scalability.

• Can be implemented using interfaces in languages like ...read more
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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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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?
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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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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
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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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Q1. Markdown related questions
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Q2. What all the challenges you have faced
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Q1. About java basics like strings , arrays
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Q2. Collections, map , hasmap
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Q1. Linux security details and indepth
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