40+ GenC Interview Questions and Answers for Freshers

Calculate the time taken by a train to pass through a tunnel given its speed, length, and the tunnel's length.

• Convert the speed of the train from mph to miles per minute.

• Calculate the time taken by the front of the train to enter the tunnel.

• Calculate the time taken by the rear of the train to exit the tunnel.

• Subtract the time taken by the front from the time taken by the rear to get the total time taken.

• Add the units to the final answer.

Google Facilitator Ready program is a training program that equips individuals with skills to facilitate Google's workshops and events.

• The program provides training on how to facilitate Google's workshops and events

• Participants learn how to create engaging content and deliver it effectively

• The program also covers how to manage logistics and handle participant questions

• Upon completion, participants receive a certificate and are eligible to facilitate Google's events

• Examples of...read more

Primary key uniquely identifies a record in a table, while foreign key refers to a field in another table.

• Primary key is used to enforce data integrity and ensure uniqueness of records.

• Foreign key is used to establish a relationship between two tables.

• A table can have only one primary key, but multiple foreign keys.

• Example: CustomerID in Orders table is a foreign key that references the Customer table's primary key.

• Primary key is denoted by a key symbol, while foreign key is ...read more

The latest technologies include AI, blockchain, 5G, quantum computing, and IoT.

• AI - machine learning, natural language processing

• Blockchain - decentralized ledgers, smart contracts

• 5G - faster internet speeds, low latency

• Quantum computing - exponential processing power

• IoT - interconnected devices, data collection

Instance variables are declared in a class and can be accessed by any method in the class. Local variables are declared in a method and can only be accessed within that method.

• Instance variables are declared at the class level, while local variables are declared within a method.

• Instance variables can be accessed by any method in the class, while local variables can only be accessed within the method they are declared in.

• Instance variables are initialized to default values, wh...read more

Python has several built-in data types including numeric, sequence, and mapping types.

• Numeric types include integers, floats, and complex numbers.

• Sequence types include lists, tuples, and strings.

• Mapping types include dictionaries.

• Boolean type is also available.

• Type() function can be used to determine the data type of a variable.

while loop checks condition before executing, do while loop executes at least once before checking condition.

• while loop is entry controlled loop, do while loop is exit controlled loop

• while loop may not execute at all if condition is false initially, do while loop executes at least once

• while loop syntax: while(condition){ //code to execute }

• do while loop syntax: do{ //code to execute }while(condition);

Conclusion II follows from the given statements.

• Statement P and Q do not provide enough information to conclude that all cakes are bags.

• However, it can be concluded that some bags are cakes as some bags are hot and all hots are cakes.

• Therefore, Conclusion II is true while Conclusion I is false.

C++ is an extension of C with object-oriented programming features.

• C++ supports classes and objects while C does not.

• C++ has better support for polymorphism and inheritance.

• C++ has a standard template library (STL) for data structures and algorithms.

• C++ allows function overloading and default arguments.

• C++ has exception handling for error management.

• C++ is more complex and has a steeper learning curve than C.

Python is the most comfortable programming language for me.

• Python has a simple and easy-to-learn syntax.

• It has a vast collection of libraries and frameworks.

• Python is versatile and can be used for various applications such as web development, data analysis, and machine learning.

• Python has a large community that provides support and resources.

• Examples: Flask, Django, NumPy, Pandas, TensorFlow.

Cognizant is a multinational technology company providing digital, technology, consulting, and operations services.

• Founded in 1994 and headquartered in Teaneck, New Jersey

• Has a global presence with operations in over 40 countries

• Offers services in areas such as artificial intelligence, cloud computing, and cybersecurity

• Works with clients across various industries including healthcare, finance, and retail

• Has over 300,000 employees worldwide

A program to reverse a given string.

• Create an empty string to store the reversed string

• Loop through the original string from the end to the beginning

• Add each character to the new string

• Return the new string

C and C++ are programming languages. C++ is an extension of C with additional features.

• C is a procedural language while C++ is an object-oriented language.

• C++ supports features like classes, inheritance, and polymorphism which are not present in C.

• C++ also has better support for templates and exception handling compared to C.

• C++ code can also be written in a more modular and reusable way compared to C.

• C++ is often used for developing complex software systems like operating sy...read more

Code to print first 10 elements of Fibonacci series.

• Declare variables for first two numbers of the series

• Use a loop to generate the next numbers in the series

• Print the first 10 numbers of the series

Java has no pointers for safety reasons and to simplify memory management.

• Java uses references instead of pointers to avoid security vulnerabilities.

• Pointers can cause memory leaks and dangling references, which Java avoids.

• Java's garbage collector automatically manages memory, making pointers unnecessary.

• Example: Java's NullPointerException is a result of using a null reference, not a pointer.

• Example: C++ allows pointer arithmetic, which can lead to buffer overflows and othe...read more

Java is platform independent because it uses the concept of bytecode and virtual machine.

• Java programs are compiled into bytecode, which is a platform-independent representation of the code.

• The bytecode is then executed by the Java Virtual Machine (JVM), which is specific to each platform.

• The JVM interprets the bytecode and translates it into machine code that can be understood by the underlying operating system.

• This allows Java programs to run on any platform that has a comp...read more

Coding to check if a given year is leap or not

• A year is a leap year if it is divisible by 4 but not by 100, or if it is divisible by 400

• Use modulo operator to check if the year is divisible by 4, 100, and 400

• Return true if the year is divisible by 4 and not by 100, or if it is divisible by 400. Else, return false

An empty class can be created by simply declaring a class with no properties or methods.

• Declare a class with no properties or methods

• Example: class EmptyClass {}

• The class can be used as a placeholder for future implementation

Constructor overloading is the ability to have multiple constructors with different parameters in a class.

• Constructor overloading allows creating objects with different initializations.

• It helps in providing flexibility and convenience to the users of the class.

• Constructors can be overloaded by changing the number, type, or order of parameters.

• Example: class Person { Person() {} Person(String name) {} }

Code to connect database in Python

• Import the required module (e.g. pymysql, sqlite3)

• Establish a connection to the database using connect() method

• Create a cursor object using cursor() method

• Execute SQL queries using execute() method

• Commit changes using commit() method

• Close the cursor and connection using close() method

HTML stands for Hypertext Markup Language. It is the standard markup language used to create web pages.

• HTML is used to structure content on the web

• It uses tags to define elements such as headings, paragraphs, and links

• It can also include multimedia elements such as images and videos

• HTML is the backbone of the web and is essential for creating websites and web applications

No, I do not have any backlogs.

• I have successfully completed all my courses and exams.

• I have maintained a good academic record throughout.

• I have never had to repeat a course or exam.

• I have always been diligent in my studies and time management.

Object-oriented programming features include encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation: bundling of data and methods that manipulate the data

• Inheritance: creating new classes from existing ones

• Polymorphism: ability of objects to take on multiple forms

• Abstraction: hiding implementation details from users

Cloud computing is the delivery of computing services over the internet.

• Cloud computing allows users to access data and applications from anywhere with an internet connection.

• It offers scalability, flexibility, and cost-effectiveness compared to traditional on-premises computing.

• Examples include Amazon Web Services, Microsoft Azure, and Google Cloud Platform.

OOPS concepts are the fundamental principles of Object-Oriented Programming that help in designing and implementing software systems.

• Encapsulation: Bundling data and methods together in a class.

• Inheritance: Creating new classes from existing ones, inheriting their properties and behaviors.

• Polymorphism: Objects of different classes can be treated as objects of a common superclass.

• Abstraction: Hiding complex implementation details and providing simplified interfaces.

• Encapsulati...read more

Polymorphism, inheritance and OOPS are concepts in object-oriented programming.

• Polymorphism allows objects of different classes to be treated as if they are of the same class.

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

• OOPS is a programming paradigm that uses objects to represent real-world entities and their interactions.

• Example of polymorphism: A shape class with different subclasses like circle, square, and triangle.

• Example of inheritanc...read more

List is mutable and tuple is immutable in Python.

• Lists can be modified while tuples cannot be modified once created.

• Lists are defined using square brackets while tuples are defined using parentheses.

• Lists are used for collections of homogeneous items while tuples are used for heterogeneous items.

• Lists are slower than tuples in terms of performance.

• Example of list: my_list = [1, 2, 3]

• Example of tuple: my_tuple = (1, 'hello', 3.14)

JVM stands for Java Virtual Machine. It is an abstract machine that enables a computer to run Java programs.

• JVM is responsible for interpreting the compiled Java code and executing it on the computer.

• It provides a platform-independent environment for Java programs to run on different operating systems.

• JVM has various components such as Class Loader, Bytecode Verifier, Just-In-Time Compiler, and Garbage Collector.

• Examples of JVM-based languages include Java, Kotlin, and Scala.

C++ is an extension of C with object-oriented programming features.

• C++ supports classes and objects while C does not.

• C++ has constructors and destructors while C does not.

• C++ supports function overloading while C does not.

• C++ has namespaces while C does not.

• C++ supports exception handling while C does not.

C++ and Java are both object-oriented programming languages, but differ in syntax, memory management, and platform compatibility.

• C++ supports multiple inheritance, while Java only supports single inheritance.

• C++ allows direct memory manipulation, while Java has a garbage collector for automatic memory management.

• C++ is closer to the hardware and provides more control, while Java is platform-independent and provides portability.

• C++ has pointers, while Java uses references.

• C++ ...read more

Memory management in Python involves allocation and deallocation of memory for objects.

• Python uses automatic memory management through garbage collection.

• Memory is allocated dynamically as objects are created.

• Unused memory is automatically deallocated through reference counting or garbage collection.

• Python provides tools like sys.getsizeof() and tracemalloc to manage memory usage.

• Memory leaks can occur if objects are not properly deallocated.

A database is a structured collection of data that is stored and organized for easy retrieval and manipulation.

• A database is used to store and manage large amounts of data.

• It allows for easy retrieval and manipulation of data.

• Data is organized into tables, with each table containing related information.

• Examples of databases include MySQL, Oracle, and MongoDB.

DBMS stands for Database Management System. It is a software that manages and organizes data in a structured manner.

• DBMS is used to create, retrieve, update, and delete data in a database.

• It provides a way to store and organize large amounts of data efficiently.

• DBMS ensures data integrity, security, and concurrency control.

• Examples of popular DBMS include MySQL, Oracle, SQL Server, and PostgreSQL.

Loops are programming structures that allow a set of instructions to be repeated multiple times.

• Loops are used to iterate over arrays or perform a set of instructions a certain number of times.

• There are three types of loops in most programming languages: for, while, and do-while.

• Example: for (var i = 0; i < 10; i++) { console.log(i); }

• Example: while (condition) { // code block }

• Example: do { // code block } while (condition);

A pointer is a variable that stores the memory address of another variable.

• Pointers allow for dynamic memory allocation and manipulation.

• They are commonly used in programming languages like C and C++.

• Example: int *ptr; ptr = # *ptr = 10; // num now has a value of 10

Types of inheritance include single, multiple, multilevel, hierarchical, hybrid, and multipath inheritance.

• Single inheritance: a class inherits from a single base class.

• Multiple inheritance: a class inherits from multiple base classes.

• Multilevel inheritance: a class inherits from a derived class, which in turn inherits from another class.

• Hierarchical inheritance: multiple classes inherit from a single base class.

• Hybrid inheritance: a combination of multiple and multilevel inh...read more

Pointers are variables that store memory addresses. They allow direct manipulation of memory and facilitate efficient memory management.

• Pointers store memory addresses

• They allow direct manipulation of memory

• They facilitate efficient memory management

Code snippet to return null

• In Java: return null;

• In Python: return None

• In C#: return null;

• In JavaScript: return null;

Arrays are fixed in size and hold elements of the same data type, while lists are dynamic and can hold elements of different data types.

• Arrays are declared with a fixed size, while lists can grow or shrink dynamically.

• Arrays can only hold elements of the same data type, while lists can hold elements of different data types.

• Arrays are accessed using an index, while lists are accessed using an iterator.

• Examples: int[] arr = new int[5]; List list = new ArrayList<>();

Function overloading is having multiple functions with the same name but different parameters, while function overriding is redefining a function in a subclass.

• Function overloading: Same function name but different parameters (e.g. sum(int a, int b) and sum(double a, double b)

• Function overriding: Redefining a function in a subclass with the same name and parameters as in the superclass

• Overloading is resolved at compile time, while overriding is resolved at runtime

Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.

• Inheritance allows for code reuse and promotes the concept of hierarchy.

• The class that is being inherited from is called the superclass or base class.

• The class that inherits from the superclass is called the subclass or derived class.

• The subclass can access the public and protected members of the superclass.

• Inheritance can be single, where a subclass inhe...read more

A program to print odd prime numbers.

• Start with a loop to iterate through all odd numbers

• Check if the number is prime using a function

• If the number is prime, print it

Inheritance is a concept in object-oriented programming where a class can inherit attributes and methods from another class.

• Allows a class to inherit attributes and methods from another class

• Promotes code reusability and reduces redundancy

• Derived class can add its own attributes and methods or override existing ones

• Example: Parent class 'Animal' with attributes 'name' and method 'eat', Child class 'Dog' inherits 'Animal' and adds attribute 'breed' and method 'bark'

An array is a collection of elements of the same data type, stored in contiguous memory locations.

• Arrays can be of any data type, including integers, floats, and objects.

• Arrays are accessed using an index, starting from 0.

• Arrays can be initialized with a fixed size or dynamically resized.

• Example: string[] names = {"John", "Jane", "Bob"};

• Example: int[] numbers = new int[5];

• Example: object[] objects = new object[3] {1, "hello", true};

A function is a block of code that performs a specific task and can be called multiple times throughout a program.

• Functions can take in parameters and return values

• Functions can be defined using function declarations or function expressions

• Functions can be assigned to variables and passed as arguments to other functions

OOPs in Java is a programming paradigm that focuses on objects and their interactions.

• Encapsulation, Inheritance, Polymorphism, and Abstraction are the four pillars of OOPs in Java.

• Encapsulation is the process of hiding implementation details from the user.

• Inheritance is the process of inheriting properties and methods from a parent class.

• Polymorphism is the ability of an object to take on many forms.

• Abstraction is the process of hiding implementation details while showing on...read more