80+ Programmer Interview Questions and Answers

You can restrict the value for a particular button pressed from the keyboard by using event listeners and conditionals in your code.

• Use event listeners to detect when a key is pressed on the keyboard

• Check the value of the key pressed and only allow the desired button to trigger an action

• You can use if statements or switch cases to restrict the value for a particular button pressed

Micro, Mini, and Mainframe computers differ in terms of size, processing power, and usage.

• Micro computers are small, low-cost, and designed for personal use.

• Mini computers are larger and more powerful than micro computers, often used in small businesses or scientific research.

• Mainframe computers are large, powerful, and used by large organizations for critical applications and data processing.

• Micro computers include laptops, tablets, and smartphones.

• Examples of mini computers...read more

Explaining Java's system.out.println statement, platform independence, and collections.

• System.out.println() is used to print output to the console in Java.

• Java is platform independent because it uses bytecode that can run on any platform with a JVM.

• Collections in Java are used to store and manipulate groups of objects, such as ArrayLists and HashMaps.

Kaizens are continuous improvement initiatives aimed at enhancing processes and efficiency. The number of completed kaizens in a year reflects the organization's commitment to improvement.

• Kaizens are small, incremental changes made to processes to improve efficiency and quality.

• They are typically implemented by cross-functional teams and involve brainstorming, testing, and implementing solutions.

• Examples of kaizens include reducing waste in production processes, streamlining ...read more

I prefer Python for programming because of its simplicity and versatility.

• Python has a simple syntax which makes it easy to learn and use.

• It has a vast library of modules and frameworks for various applications.

• Python is versatile and can be used for web development, data analysis, machine learning, and more.

• It is also open-source and has a large community for support and development.

• Examples: Django for web development, NumPy for scientific computing, TensorFlow for machine ...read more

OOPs is Object Oriented Programming. Java and Python are both OOPs languages, but differ in syntax and usage.

• Java is statically typed, while Python is dynamically typed

• Java requires more verbose syntax, while Python is more concise

• Java is better suited for large-scale enterprise applications, while Python is better for scripting and data analysis

• Java has a stronger emphasis on performance, while Python prioritizes ease of use and readability

• Both languages support inheritance,...read more

C program projects for Final Year can include developing a text editor, implementing a file compression algorithm, or creating a simple operating system.

• Developing a text editor: This project involves creating a program that allows users to create, edit, and save text files.

• Implementing a file compression algorithm: This project focuses on developing a program that can compress and decompress files using algorithms like Huffman coding or Lempel-Ziv-Welch (LZW) compression.

• Cre...read more

jQuery provides various methods to manipulate CSS display properties like inline, block, and inline-block.

• Use .css() to set display property: $('.element').css('display', 'block');

• Toggle display with .toggle(): $('.element').toggle();

• Check display type with .is(): if ($('.element').is(':visible')) { ... }

• Hide elements with .hide(): $('.element').hide();

• Show elements with .show(): $('.element').show();

Database is crucial for storing and managing data in backend development.

• Database stores and organizes data for efficient retrieval and manipulation.

• It allows for easy querying and filtering of data.

• It enables data consistency and integrity through constraints and validations.

• It facilitates data migration and backup.

• Examples include MySQL, MongoDB, and PostgreSQL.

Crestron application license has free and paid versions with different working details.

• Crestron application is a software used for automation and control systems.

• The free version has limited features and is meant for personal use.

• The paid version has advanced features and is meant for commercial use.

• The license is required to activate the software and access all its features.

• The working details depend on the specific version and license purchased.

We are currently working on drilling, milling, tapping, and slotting machining processes.

• Drilling involves creating holes in a workpiece using a rotating cutting tool.

• Milling is the process of removing material from a workpiece using a rotating cutter.

• Tapping is the process of creating internal threads in a hole.

• Slotting involves cutting slots or grooves in a workpiece.

Java is a high-level programming language that is platform-independent and object-oriented. It is executed on command prompt using the 'java' command.

• Java is a high-level programming language known for its portability and versatility.

• To execute a Java program on command prompt, first compile the program using the 'javac' command to generate a .class file.

• Then, use the 'java' command followed by the name of the class containing the main method to run the program.

• For example, t...read more

Use binary search to find the first and last occurrence of the character, then calculate the frequency.

• Use binary search to find the first occurrence of the character in the string.

• Use binary search to find the last occurrence of the character in the string.

• Calculate the frequency by subtracting the indices of the last and first occurrences and adding 1.

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

• Python is an interpreted language, meaning it does not need to be compiled before running.

• It has a large standard library that provides many pre-built functions and modules.

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

• It is widely used in various domains such as web development, data analysis, artificial intelligence, and au...read more

The 'implements' keyword is used to indicate that a class is implementing an interface.

• The 'implements' keyword is followed by the name of the interface that the class is implementing.

• A class can implement multiple interfaces by separating them with commas.

• All methods declared in an interface must be implemented by the class that implements it.

• Example: 'public class MyClass implements MyInterface { ... }'

RS232 protocol is a standard for serial communication. Third-party device control can be achieved using this protocol.

• RS232 protocol is a standard for serial communication between devices.

• Third-party device control can be achieved by sending commands over RS232.

• Commands can be sent using a terminal emulator or programming language.

• Examples of devices that can be controlled using RS232 include printers, scanners, and industrial equipment.

Union combines and removes duplicates, while Union All combines without removing duplicates.

• Union removes duplicates from the result set, while Union All does not.

• Union is slower than Union All because it has to perform the additional step of removing duplicates.

• Union All is used when you want to include all rows from both tables, including duplicates.

OOPs concepts and pillars. Design a Vehicle class based on requirements.

• OOPs concepts: Abstraction, Encapsulation, Inheritance, Polymorphism

• Vehicle class requirements: attributes like make, model, year, methods like start, stop, accelerate

Truncate removes all data from a table while delete removes specific rows.

• Truncate is faster than delete as it doesn't log individual row deletions

• Truncate cannot be rolled back while delete can be

• Truncate resets the identity of the table while delete doesn't

• Truncate doesn't fire triggers while delete does

• Truncate is a DDL command while delete is a DML command

RS232 commands can be sent over IR port using an IR to RS232 converter.

• Use an IR to RS232 converter to convert the IR signals to RS232 commands.

• Connect the IR to RS232 converter to the device that needs to receive the commands.

• Send the RS232 commands through the IR port using the converter.

• Ensure that the IR port and the converter are compatible with each other and the device.

• Test the connection and commands to ensure proper functionality.

OEE is a measure of how well a manufacturing process is utilized, calculated by multiplying availability, performance, and quality.

• OEE is calculated by multiplying Availability x Performance x Quality.

• Availability measures the percentage of time the equipment is running during planned production time.

• Performance measures the speed at which the equipment is running compared to its maximum speed.

• Quality measures the good units produced compared to the total units produced.

• For e...read more

Calculate average age of male and female and list below average age.

• Separate male and female ages into two arrays

• Calculate average of each array

• List out ages below the average for each array

Visual Studio Tools for Office (VSTO) is a set of tools and features that enable developers to create custom Office solutions.

• VSTO allows developers to extend and customize Microsoft Office applications such as Excel, Word, and Outlook.

• It provides a way to add new functionality to Office applications using managed code.

• Developers can create add-ins, document-level customizations, and other solutions using VSTO.

• VSTO integrates with Visual Studio IDE to provide a seamless devel...read more

Credit card detection uses machine learning models.

• Machine learning models like logistic regression, decision trees, and neural networks are used for credit card detection.

• These models analyze patterns in credit card transactions to detect fraudulent activity.

• The models are trained on large datasets of both legitimate and fraudulent transactions.

• The models can be updated and improved over time as new data becomes available.

8D is a problem-solving methodology used to identify, correct, and prevent recurring problems. SPC stands for Statistical Process Control.

• 8D is an eight-step problem-solving process used to address and prevent recurring issues in a systematic manner.

• SPC is a method of quality control which uses statistical tools to monitor and control a process.

• Examples of SPC tools include control charts, histograms, and scatter diagrams.

Stack can be implemented using arrays or linked lists. It follows LIFO (Last In First Out) principle.

• Create an empty array or linked list

• Push elements onto the stack

• Pop elements from the stack

• Check if the stack is empty

• Example: Infix to Postfix conversion using stack

• Example: Undo/Redo functionality in text editors

Understanding OOP concepts is crucial for effective coding, enabling better organization and reusability of code.

• Encapsulation: Bundling data and methods that operate on the data within one unit, e.g., a class in Java.

• Inheritance: Mechanism to create a new class using properties of an existing class, e.g., a 'Dog' class inheriting from an 'Animal' class.

• Polymorphism: Ability to present the same interface for different data types, e.g., method overloading in C++.

• Abstraction: H...read more