Zynga Game Network Software Developer Interview Questions and Answers

Classes, oops, array, constructor

Q1. Write a code for copy constructor
Ans. 
A copy constructor is a special type of constructor that creates a new object as a copy of an existing object.
• Copy constructor should have a parameter of the same class type

• It is used to create a new object by copying the values of an existing object

• It is called when a new object is created from an existing object
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Q2. Write a code for virtual function
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A virtual function is a member function that is declared within a base class and is redefined by a derived class.
• Declare a virtual function in the base class using the 'virtual' keyword.

• Override the virtual function in the derived class using the 'override' keyword.

• Use the base class pointer to call the virtual function, which will be resolved at runtime based on the actual object type.
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Q1. Design patterns
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Q2. Oops concept and implementation
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Oops concept refers to Object-Oriented Programming principles and their implementation in software development.
• Oops concepts include inheritance, polymorphism, encapsulation, and abstraction.

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

• Polymorphism allows objects to be treated as instances of their parent class.

• Encapsulation hides the internal state of an object and only exposes nec...read more
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Three coding online assessments - screening round.

Two to three coding questions based on dynamic programming.

Q1. Resume based and computer network
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Q1. Simple hr question
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There were two coding questions; one was related to linked lists, and the other was linked to binary trees.

Q1. Can you elaborate on the project discussion you mentioned in your resume?
Ans. 
Developed a web application for tracking inventory and sales data
• Used React for front-end development

• Implemented RESTful APIs using Node.js and Express for back-end

• Utilized MongoDB for database management

• Integrated authentication and authorization features for secure access

• Implemented data visualization using Chart.js
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Q2. Can you provide the code to reverse a linked list?
Ans. 
Reversing a linked list involves changing the direction of pointers to go from the end to the beginning.
• Start by initializing three pointers: current, previous, and next.

• Iterate through the linked list, updating the pointers to reverse the direction of the links.

• Update the head of the linked list to point to the new first node, which was the original last node.
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Q3. Some questions were asked regarding the four pillars of Object-Oriented Programming (OOP)?
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Q4. Questions related to pointers, dangling pointers.
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Q1. Program for finding the perfect squares between two numbers.
Ans. 
Program to find perfect squares between two numbers
• Iterate through numbers between the given range

• Check if the square root of the number is an integer

• If yes, then it is a perfect square
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Q2. What are smart pointers in C++?
Ans. 
Smart pointers in C++ are objects that act like pointers but provide automatic memory management.
• Smart pointers help prevent memory leaks by automatically managing memory allocation and deallocation.

• Examples include unique_ptr, shared_ptr, and weak_ptr.

• unique_ptr is used for exclusive ownership, shared_ptr for shared ownership, and weak_ptr to prevent circular references.
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Q3. What is mutual exclusion in the context of concurrent programming?
Ans. 
Mutual exclusion is a concept in concurrent programming where only one thread can access a shared resource at a time.
• Ensures that only one thread can access a critical section of code at a time

• Prevents race conditions and data corruption

• Commonly implemented using locks, semaphores, or mutexes

• Example: Using a mutex to protect a shared variable in a multi-threaded application
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Q4. What is the process for implementing multithreading?
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Implementing multithreading involves creating and managing multiple threads to execute tasks concurrently.
• Identify the tasks that can be executed concurrently

• Create and manage multiple threads to execute these tasks simultaneously

• Use synchronization techniques like locks and semaphores to prevent race conditions

• Handle communication and coordination between threads

• Consider thread safety and resource sharing issues
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Basic aptitude test, if you know basic maths you can easily crack it.

Q1. Basic question about qualification about experience suitable for role or not
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Q1. Oops concepts should be strong.
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Q2. Strong knowledge with c#
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Q3. Asp .net, MVC, web APIs, .net core .
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Q1. Senior lead will take this round and deep knowledge of technology
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Q1. Manager round with skills and experience
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Q1. International call one to one
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Q1. Final discussion for salary and all
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MCQ based on programming, 2 programming problems

Q1. What is copy constructor ?
Ans. 
Copy constructor is a special constructor that creates a new object by copying an existing object.
• It is used to initialize an object with another object of the same class.

• It takes a reference to an object of the same class as an argument.

• It creates a new object with the same values as the object passed as argument.

• It is automatically called when a new object is created from an existing object.

• Example: MyClass obj1; MyC
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Q2. What is shallow copy and deep copy ?
Ans. 
Shallow copy creates a new object with the same reference as the original, while deep copy creates a new object with a new reference.
• Shallow copy only copies the top-level object, while deep copy copies all nested objects.

• Shallow copy is faster and uses less memory, while deep copy is slower and uses more memory.

• Examples of shallow copy include copying arrays and objects using the spread operator, while examples of dee...read more
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Q3. Implement Merge Sort on an array
Ans. 
Implementation of Merge Sort on an array
• Divide the array into two halves

• Recursively sort the two halves

• Merge the sorted halves

• Time complexity: O(n log n)

• Space complexity: O(n)
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Q4. What are Virtual Functions ?
Ans. 
Virtual functions are functions that can be overridden by derived classes.
• Virtual functions are declared in a base class and can be overridden in derived classes.

• They allow for polymorphism, where a derived class object can be treated as a base class object.

• Virtual functions are called based on the actual object type, not the pointer or reference type.

• They are declared using the virtual keyword in the base class and ca...read more
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Q5. What are you good at in C++ ?
Ans. 
I am good at object-oriented programming, data structures, and algorithms in C++.
• Strong understanding of object-oriented programming principles

• Proficient in implementing data structures and algorithms in C++

• Experience with memory management and pointers

• Familiarity with C++ standard library and STL

• Ability to optimize code for performance and efficiency
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Q1. Why do you want to get this job ?
Ans. 
I am passionate about software development and this job aligns perfectly with my skills and interests.
• I have a strong passion for software development and enjoy solving complex problems.

• This job offers the opportunity to work on cutting-edge technologies and contribute to innovative projects.

• I am excited about the company's mission and values, and believe in the positive impact software can have on society.

• I am eager t...read more
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Q2. How long will you stay in this company ?
Ans. 
I am committed to staying with the company for the long term and contributing to its success.
• I am looking for a stable and challenging work environment.

• I believe in the company's mission and values.

• I am eager to grow and develop my skills within the company.

• I am open to new opportunities and challenges that may arise.

• I am committed to building strong relationships with my colleagues and contributing to a positive work
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Q1. Polymorphism in C++
Ans. 
Polymorphism in C++ allows objects of different classes to be treated as objects of a common superclass.
• Polymorphism is achieved through function overloading and virtual functions.

• Function overloading allows multiple functions with the same name but different parameters.

• Virtual functions are functions in a base class that are overridden in derived classes.

• Example: Animal class with virtual function 'makeSound', Cat and
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Q2. Standard template library in C++
Ans. 
STL in C++ provides reusable algorithms and data structures for efficient programming.
• STL includes containers like vector, list, map, algorithms like sort, find, and iterators.

• Example: vector v = {1, 2, 3}; sort(v.begin(), v.end());

• STL saves time by providing pre-implemented solutions for common programming tasks.
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Q3. Design Patterns in C++
Ans. 
Design patterns in C++ are reusable solutions to common problems in software design.
• Design patterns help in creating flexible, maintainable, and scalable code.

• Examples of design patterns in C++ include Singleton, Factory, Observer, and Strategy.

• Each design pattern has a specific purpose and can be applied in different scenarios.

• Understanding design patterns can improve code quality and efficiency in software developmen
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