63 Moons Technologies Interview Questions and Answers

Paper pen round
1. Aptitude questions (profit and loss, coding decoding, missing number , time and distance etc)
2. C++ mcq questions(constructor and destructor, virtual functions, class and objects, pointer, oops concept)

Q1. What is class and objects in c++?
Ans. 
Class is a blueprint for creating objects. Objects are instances of a class with their own set of properties and methods.
• Classes define the properties and methods that objects will have

• Objects are created from a class using the 'new' keyword

• Objects can interact with each other through their methods and properties

• Example: class Car { int speed; void accelerate(); }; Car myCar; myCar.accelerate();

• Example: class Person { ...read more
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Q2. About Constructor and destructor , Types of constructor, How constructor called?
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Q3. Memory management of variable and objects
Ans. 
Memory management involves allocating and deallocating memory for variables and objects.
• Variables can be allocated on the stack or heap depending on their scope and lifetime.

• Objects can be created using new operator and must be deleted using delete operator to avoid memory leaks.

• Smart pointers like unique_ptr and shared_ptr can be used to manage object memory automatically.

• Memory leaks can be avoided by properly managi...read more
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Q4. Difference between stack memory and heap memory
Ans. 
Stack memory is allocated automatically, while heap memory is allocated manually.
• Stack memory is limited and has a fixed size, while heap memory is larger and can grow dynamically.

• Stack memory is faster to access than heap memory.

• Stack memory is used for local variables and function calls, while heap memory is used for dynamic memory allocation.

• Examples of stack memory include function call stack and local variables, w...read more
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Q5. About function overloading and overriding in c++?
Ans. 
Function overloading allows multiple functions with the same name but different parameters; overriding replaces a base class function in a derived class.
• Overloading occurs within the same scope, e.g., void func(int) and void func(double).

• Overriding requires a base class and derived class, e.g., virtual void baseFunc() in base and void baseFunc() in derived.

• Overloaded functions can differ by number or type of parameters...read more
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Q1. Work Ex Discussion
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Q1. System Design question- Implement APIs
Ans. 
Design APIs for a scalable system to manage user data and interactions efficiently.
• Define RESTful endpoints: e.g., GET /users, POST /users, PUT /users/{id}, DELETE /users/{id}.

• Use JSON for data interchange to ensure compatibility across platforms.

• Implement authentication and authorization: e.g., OAuth 2.0 for secure access.

• Consider rate limiting to prevent abuse of the APIs.

• Design for scalability: use load balancers an...read more
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Q1. System Design question- Design DB
Ans. 
Design a database for a scalable e-commerce platform to manage products, users, and orders efficiently.
• Use a relational database like PostgreSQL for structured data.

• Create tables for Users, Products, Orders, and Order_Items.

• Implement indexing on frequently queried fields like product name and user email.

• Consider using NoSQL for unstructured data, such as user reviews.

• Ensure data normalization to reduce redundancy, e.g....read more
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Q1. System Design question- Microservices
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Q1. Tell me about Trade Life Cycle
Ans. 
The Trade Life Cycle encompasses all stages of a trade from initiation to settlement, ensuring smooth transaction processing.
• 1. Trade Initiation: The process begins when a trader decides to buy or sell a security.

• 2. Order Execution: The order is sent to the market, where it is matched with a counterparty.

• 3. Trade Confirmation: Both parties receive confirmation of the trade details, including price and quantity.

• 4. Clear...read more
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Q2. Derivatives , BRD, FRD, Waterfall Model, Agile Methodologies, Captial Market , Intra day,
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Q3. Write an essay based on any current incidents national level and give a suitable solution
Ans. 
The rising issue of food insecurity in the U.S. demands immediate attention and innovative solutions to ensure access to nutritious food.
• Food insecurity affects millions of Americans, with 10.5% of households experiencing it in 2020.

• The COVID-19 pandemic exacerbated food access issues, leading to increased reliance on food banks.

• Innovative solutions include community gardens, urban farming, and partnerships with local ...read more
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Q4. Scenario Based Question
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Q1. HR round mandatory
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Q2. Technical round first and second
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