20+ Coditas Technologies Interview Questions and Answers for Freshers

To pour exactly 9 liters of water into a 12-liter gallon using 5 and 3-liter gallons.

• Fill the 5-liter gallon and pour it into the 12-liter gallon.

• Fill the 5-liter gallon again and pour it into the 12-liter gallon until it is full, leaving 1 liter in the 5-liter gallon.

• Empty the 12-liter gallon and pour the remaining 1 liter from the 5-liter gallon into it.

• Fill the 5-liter gallon again and pour it into the 12-liter gallon to get exactly 9 liters.

There are multiple ways to measure a 3 storeyed building, including using a measuring tape, laser distance meter, or counting the number of steps.

• Using a measuring tape to measure the height of each storey and adding them up.

• Using a laser distance meter to calculate the total height of the building.

• Counting the number of steps from the ground floor to the top floor and multiplying by the height of each step.

• Estimating the height based on the standard height of a storey in the...read more

Extract numbers from a string of alphanumeric characters.

• Iterate through each character in the string and check if it is a number.

• Build a new string with only the numbers found in the original string.

• Return the final string containing only the numbers.

Encapsulation, Inheritance, Polymorphism, Abstraction are the four pillars of OOPS

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Class Car with properties like make, model, and methods like start(), stop().

• Inheritance: Ability of a class to inherit properties and behavior from another class. Example: Class SUV inheriting from Class Car.

• Polymorphism: Ability to present the same interface for different data types. Example: Method ...read more

Python is a high-level, interpreted programming language known for its simplicity and readability.

• Python uses indentation to define code blocks, making it easier to read and understand.

• Python has a large standard library with built-in functions and modules for various tasks.

• Python supports multiple programming paradigms, including procedural, object-oriented, and functional programming.

• Python is dynamically typed, meaning variable types are determined at runtime.

• Python is pop...read more

Code to get unique elements of an array of strings

• Create a Set to store unique elements

• Iterate through the array and add elements to the Set

• Convert the Set back to an array to get unique elements

To add a link to your Linkedin account in a website by clicking on the logo, use the <a> tag with the href attribute set to your Linkedin profile URL.

• Use the <a> tag with the href attribute set to your Linkedin profile URL

• Insert the Linkedin logo image inside the <a> tag as the clickable element

• Example: <a href='https://www.linkedin.com/in/yourprofile'><img src='linkedin_logo.png' alt='Linkedin'></a>

OOPS (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.

• OOPS focuses on creating objects that interact with each other to solve a problem

• It involves concepts like classes, objects, inheritance, polymorphism, and encapsulation

• Example: Inheritance allows a class to inherit properties and behavior from another class

The choice of database depends on factors like data structure, scalability, performance, and query requirements.

• Consider the data structure and relationships between entities.

• Evaluate the scalability requirements of the task.

• Analyze the performance needs, including read and write operations.

• Assess the query requirements, such as complex joins or aggregations.

• Examples: relational databases for structured data, NoSQL for unstructured or rapidly changing data.

The task is to add the consecutive numbers present in a given string.

• Iterate through the string character by character

• Check if the current character is a digit

• If it is a digit, continue iterating until a non-digit character is encountered

• Convert the consecutive digits into a number and add it to the sum

• Repeat the process until all characters are processed

• Return the sum

Database management features include data storage, retrieval, indexing, and security.

• Data storage: ability to store large amounts of data efficiently

• Data retrieval: ability to quickly access and retrieve specific data

• Indexing: optimizing data retrieval by creating indexes on columns

• Security: ensuring data is protected from unauthorized access

JDBC is a Java API for connecting and executing queries on a database.

• JDBC stands for Java Database Connectivity.

• It provides a set of classes and interfaces to interact with databases.

• JDBC allows developers to write database-independent code.

• It supports various database operations like connecting, querying, updating, and deleting data.

• JDBC drivers are used to establish a connection between Java application and database.

• Example: Class.forName("com.mysql.jdbc.Driver");

Sorting an array of strings

• Use a sorting algorithm like quicksort or mergesort

• Consider the length of the strings for comparison

• Use a comparator function to define custom sorting criteria

C++ supports multiple inheritance while Java supports single inheritance.

• C++ allows a class to inherit from multiple classes, while Java only allows a class to inherit from a single class.

• In C++, a class can have multiple parent classes, resulting in a complex class hierarchy.

• Java enforces single inheritance to avoid the diamond problem and maintain simplicity.

• For example, in C++, a class can inherit from both a 'Vehicle' class and a 'Animal' class, while in Java, it can only...read more

SQL databases are structured and use a fixed schema, while NoSQL databases are unstructured and have a flexible schema.

• SQL databases use structured query language for defining and manipulating the data.

• NoSQL databases use various data models like key-value, document, columnar, or graph.

• SQL databases are suitable for complex queries and transactions.

• NoSQL databases are horizontally scalable and provide high performance for large datasets.

• SQL databases ensure data integrity wit...read more

Relational databases store data in tables with predefined relationships. Non-relational databases store data in flexible, schema-less formats.

• Relational databases: MySQL, Oracle, SQL Server

• Non-relational databases: MongoDB, Cassandra, Redis

• Relational databases use structured query language (SQL) for data manipulation

• Non-relational databases provide high scalability and flexibility

• Relational databases are suitable for complex, structured data

• Non-relational databases are suitab...read more

OOP stands for Object-Oriented Programming. Its five pillars are encapsulation, inheritance, polymorphism, abstraction, and composition.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (object).

• Inheritance: Creating new classes by inheriting attributes and methods from existing classes.

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

• Abstraction: Hiding complex implementation details and showing on...read more

div is a block-level element while span is an inline element in HTML.

• div is used to group block-level elements and create sections on a webpage.

• span is used to style inline elements or group text within a block-level element.

• div elements create a line break before and after the element, while span does not.

SQL select query syntax and types of join

• SQL SELECT query syntax: SELECT column1, column2 FROM table_name WHERE condition

• Types of joins: INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN

• Example: SELECT orders.order_id, customers.customer_name FROM orders INNER JOIN customers ON orders.customer_id = customers.customer_id

Types of databases include relational, NoSQL, object-oriented, and graph databases.

• Relational databases store data in tables with predefined schemas, using SQL for querying (e.g. MySQL, Oracle)

• NoSQL databases are schema-less and provide flexible data models (e.g. MongoDB, Cassandra)

• Object-oriented databases store objects as they are, with support for inheritance and encapsulation (e.g. db4o)

• Graph databases use nodes and edges to represent relationships between data (e.g. Neo4...read more

Polymorphish is a term used to describe the ability of a programming language to allow different data types to be used interchangeably.

• Polymorphish allows for flexibility in coding by allowing variables to hold different types of data.

• It is a key feature in object-oriented programming languages like Java and C++.

• For example, a function can accept different types of parameters and return different types of values based on the input.

Overriding is a concept in object-oriented programming where a subclass provides a specific implementation of a method that is already provided by its superclass.

• Overriding allows a subclass to provide a specific implementation of a method that is already defined in its superclass.

• The method in the subclass must have the same name, return type, and parameters as the method in the superclass to override it.

• Example: class Animal { void makeSound() { System.out.println('Animal s...read more

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

• Allows a class to inherit properties and behaviors from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Derived class can access public and protected members of the base class

• Example: Class 'Car' can inherit from class 'Vehicle' to reuse common attributes like 'color' and 'speed'

Find duplicates in a list of elements.

• Iterate through the list and keep track of elements seen so far

• If an element is already in the seen elements, it is a duplicate

• Use a hash set to efficiently check for duplicates