100+ GenC Interview Questions and Answers

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.

Data structures are ways to organize and store data. Two examples are arrays and linked lists.

• Arrays are a collection of elements of the same data type, stored in contiguous memory locations.

• Linked lists are a collection of nodes, each containing data and a reference to the next node in the list.

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

• Functions help in modularizing code and making it reusable.

• Functions can take parameters and return values.

• Functions can be defined in different ways such as function declaration, function expression, arrow function, etc.

• Examples of functions include Math.max(), console.log(), and document.getElementById().

There are various algorithm methods in machine learning, such as supervised learning, unsupervised learning, and reinforcement learning.

• Supervised learning: Algorithms learn from labeled data to make predictions or classifications.

• Unsupervised learning: Algorithms learn from unlabeled data to discover patterns or relationships.

• Reinforcement learning: Algorithms learn through trial and error to maximize rewards.

• Other methods include semi-supervised learning, transfer learning,...read more

A loop is a programming construct that repeats a set of instructions until a certain condition is met.

• Loops are used to automate repetitive tasks in programming.

• There are three types of loops: for, while, and do-while.

• For example, a for loop can be used to iterate over an array and perform a certain action on each element.

• A while loop can be used to repeat a set of instructions until a certain condition is no longer true.

• A do-while loop is similar to a while loop, but it alwa...read more

Machine learning is a subset of artificial intelligence that enables machines to learn from data and improve their performance.

• Machine learning involves training algorithms to make predictions or decisions based on data.

• It uses statistical techniques to identify patterns in data and make predictions.

• Examples include image recognition, speech recognition, and recommendation systems.

• Machine learning can be supervised, unsupervised, or semi-supervised.

• It is used in various indus...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

Supervised learning uses labeled data to train models while unsupervised learning uses unlabeled data.

• Supervised learning requires a target variable to be predicted while unsupervised learning does not.

• Supervised learning algorithms include regression, classification, and decision trees while unsupervised learning algorithms include clustering and association.

• Examples of supervised learning include predicting housing prices and classifying emails as spam or not, while example...read more

Data structures are ways of organizing and storing data in a computer so that it can be accessed and used efficiently.

• Data structures can be linear or non-linear

• Examples of linear data structures include arrays, linked lists, and stacks

• Examples of non-linear data structures include trees and graphs

• Choosing the right data structure is important for efficient algorithm design

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

The conclusions cannot be determined from the given statements.

• Statement P and Q do not have a direct relationship.

• There is no information given about the relationship between calculators and cameras.

• Therefore, neither conclusion can be drawn.

I am comfortable in multiple programming languages including Python, Java, and C++.

• Python

• Java

• C++

I would adapt by learning Java and leveraging my programming skills to transition smoothly.

• I would start by taking online courses or tutorials to quickly learn Java syntax and best practices.

• I would also seek guidance from colleagues or mentors who are experienced in Java programming.

• I would practice coding in Java by working on small projects or contributing to open source projects.

• I would stay updated on Java trends and advancements to ensure I am proficient in the language...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);

There are four types of Joins in SQL: Inner Join, Left Join, Right Join, and Full Outer Join.

• Inner Join returns only the matching rows from both tables.

• Left Join returns all the rows from the left table and matching rows from the right table.

• Right Join returns all the rows from the right table and matching rows from the left table.

• Full Outer Join returns all the rows from both tables, with NULL values in the columns where there is no match.

• Examples: SELECT * FROM table1 INNER...read more

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.

SQL query to find duplicate items in a database.

• Use GROUP BY clause to group the items by their values

• Use HAVING clause to filter out groups with count greater than 1

• Select the columns you want to display in the result

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

Yes, Python is case sensitive. Decorators are functions that modify the behavior of other functions.

• Python is case sensitive, meaning that 'hello' and 'Hello' are two different variables

• Decorators are functions that take another function as input and extend its functionality

• They are denoted by the '@' symbol and placed above the function definition

• Example: @decorator_function def my_function(): # code here

• Common decorators include @staticmethod, @classmethod, and @property

Recursion function code and finding smallest product of 10 whole numbers.

• Recursion function code: function recursion(num) { if(num === 0) { return 1; } else { return num * recursion(num-1); } }

• To find smallest product of 10 whole numbers, we can multiply the smallest 5 negative numbers with the smallest 5 positive numbers.

• Example: [-5, -4, -3, -2, -1, 1, 2, 3, 4, 5] => (-5) * (-4) * (-3) * (-2) * (-1) * 1 * 2 * 3 * 4 * 5 = -1200

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) {} }

Prefix notation is a way of writing mathematical expressions where the operator comes before the operands.

• Also known as Polish notation

• Example: + 2 3 is equivalent to 2 + 3

• Useful in computer science for evaluating expressions

• Requires less parentheses than infix notation

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

Find the 3rd largest odd number in an array of strings.

• Convert the array of strings to an array of integers.

• Filter out the odd numbers from the array.

• Sort the odd numbers in descending order.

• Return the 3rd element from the sorted array.

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 while tuple is immutable.

• Lists can be modified while tuples cannot

• Lists use square brackets [] while tuples use parentheses ()

• Lists are used for collections of data that can be changed while tuples are used for fixed collections of data

• Lists are slower than tuples

• Example: list = [1, 2, 3], tuple = (1, 2, 3)

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.

I know multiple programming languages including Java, Python, and C++.

• Proficient in Java, Python, and C++

• Familiar with JavaScript, HTML, and CSS

• Experience with SQL and NoSQL databases

Attempting to modify an immutable object will result in a compilation error or runtime exception.

• Attempting to modify a string literal will result in a compilation error.

• Trying to modify elements of an immutable list like ImmutableList in Java will throw an UnsupportedOperationException.

• Modifying a frozen set in Python will raise a TypeError.

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.