30+ Bhatia’s Mobile Interview Questions and Answers

COMP and COMP-3 are data types used in COBOL programming language.

• COMP is a binary data type that stores numeric values as binary integers.

• COMP-3 is a packed decimal data type that stores numeric values as packed decimal digits.

• COMP uses less storage space compared to COMP-3.

• COMP-3 is more suitable for decimal arithmetic operations.

• COMP-3 values are stored in a packed format, where each digit occupies half a byte.

• COMP-3 values can represent both positive and negative numbers.

To eliminate duplicates from 2 files and send them to another output file, we can use a combination of file reading, hashing, and file writing.

• Read the contents of both files and store them in separate arrays or lists.

• Create a hash table or dictionary to keep track of the unique elements in the arrays.

• Iterate through the arrays and add each element to the hash table. If the element already exists, skip it.

• Write the contents of the hash table to the output file.

• If needed, writ...read more

To check if a file is empty or not, we can use the file's size or read the file and check for any content.

• Get the size of the file using file system APIs and check if it is zero.

• Read the file and check if it contains any content.

• Handle exceptions or errors that may occur during file operations.

Use command line tools like ping or curl to check server status.

• Use ping command to check if server is reachable

• Use curl command to check if server is responding with HTTP status code 200

• Use telnet command to check if server is listening on a specific port

• Use monitoring tools like Nagios or Zabbix to automate server status checks

Data can pass from JCL to COBOL program in multiple ways, such as through input files, system symbols, and program parameters.

• Input files: Data can be passed to a COBOL program through input files specified in the JCL.

• System symbols: JCL can define system symbols that can be accessed by the COBOL program to retrieve data.

• Program parameters: JCL can pass parameters to the COBOL program, which can be used to receive data.

• Environment variables: JCL can set environment variables ...read more

To insert or update data in a table, use SQL statements like INSERT INTO or UPDATE.

• For inserting data, use the INSERT INTO statement followed by the table name and column names.

• Specify the values to be inserted using the VALUES keyword.

• For updating data, use the UPDATE statement followed by the table name.

• Set the column values to be updated using the SET keyword.

• Use conditions with the WHERE clause to specify which rows to update.

An array is a data structure that stores a collection of elements of the same type.

• Arrays can be used to store and access multiple values using a single variable.

• To load data into an array of strings, you can assign values to each element individually or use a loop.

• Example: String[] names = {"John", "Jane", "Mike"};

• Example: for(int i = 0; i < names.length; i++) { names[i] = "Value" + i; }

S0C7 abend is a mainframe error caused by invalid data. It can be resolved by identifying the source of the error and correcting it.

• S0C7 abend is caused by invalid data in a numeric field

• To resolve it, identify the source of the error and correct it

• Common causes include incorrect data types, invalid characters, and overflow

• Debugging tools like IBM Debug Tool can help identify the source of the error

DBMS stands for Database Management System. It is used to manage and organize data in a structured manner.

• DBMS is a software system that allows users to define, create, maintain and control access to databases.

• It provides a way to store and retrieve data efficiently and effectively.

• DBMS helps in maintaining data integrity, security and consistency.

• Examples of DBMS include MySQL, Oracle, SQL Server, MongoDB, etc.

A network is a group of interconnected devices that communicate with each other. There are three types of networks: LAN, WAN, and MAN.

• A LAN (Local Area Network) is a network that covers a small area, like a home or office.

• A WAN (Wide Area Network) is a network that covers a large area, like a city or country.

• A MAN (Metropolitan Area Network) is a network that covers a larger area than a LAN but smaller than a WAN, like a city.

• Other types of networks include WLAN (Wireless Loc...read more

MVC stands for Model-View-Controller. It is a software design pattern used to separate an application's concerns.

• Model represents the data and business logic

• View displays the data to the user

• Controller handles user input and updates the model and view accordingly

• MVC promotes separation of concerns and modularity

• Examples include Ruby on Rails, ASP.NET MVC, and Spring MVC

Turing machine is a theoretical device that manipulates symbols on a strip of tape according to a table of rules.

• Turing machine is a mathematical model of computation that defines the concept of algorithm.

• It consists of a tape divided into cells, a read/write head, and a set of rules for transitioning between states.

• Turing machines can simulate any algorithmic process, making them a fundamental concept in computer science.

• They are used in theoretical computer science to study...read more

C is a programming language used for system programming, embedded systems, and game development.

• C was developed by Dennis Ritchie at Bell Labs in 1972.

• It is a compiled language, meaning that the code is translated into machine-readable instructions before execution.

• C is known for its efficiency and low-level control over hardware, making it a popular choice for operating systems and device drivers.

• C functions are defined with a return type, name, and parameters, and can be ca...read more

A microprocessor is a small computer chip that performs arithmetic and logic operations.

• Microprocessors are the heart of modern computers and electronic devices.

• They are made up of millions of transistors that switch on and off to perform calculations.

• Microprocessors fetch instructions from memory, decode them, and execute them.

• Examples of microprocessors include Intel's Pentium and AMD's Ryzen processors.

• Microprocessors are used in a wide range of applications, from smartpho...read more

Micro control is a type of control system that uses microprocessors to control various devices and processes.

• Micro control systems are used in various applications such as home automation, industrial automation, and robotics.

• They are designed to be compact and efficient, with low power consumption and high processing power.

• Micro control systems can be programmed using various programming languages such as C, C++, and assembly language.

• They can be used to control various devic...read more

Embedded systems are computer systems designed to perform specific tasks within a larger system.

• Embedded systems are often used in devices such as medical equipment, automobiles, and home appliances.

• They typically have limited processing power and memory compared to general-purpose computers.

• They are designed to be reliable and efficient, often running on low-power processors.

• Programming languages commonly used for embedded systems include C and assembly language.

• Embedded sys...read more

JWT stands for JSON Web Token, a compact and self-contained way to securely transmit information between parties as a JSON object.

• JWT is commonly used for authentication and information exchange in web applications.

• It consists of three parts: header, payload, and signature.

• The header typically consists of the type of token and the signing algorithm.

• The payload contains the claims, which are statements about an entity (user) and additional data.

• The signature is used to verify ...read more

SQL is a relational database management system, while NoSQL is a non-relational database management system.

• SQL databases are table-based and have a predefined schema, while NoSQL databases are document-based, key-value pairs, graph databases, or wide-column stores.

• SQL databases are good for complex queries and transactions, while NoSQL databases are better for hierarchical data storage and real-time web applications.

• Examples of SQL databases include MySQL, Oracle, and Postgre...read more

Microservices are a software architecture pattern where applications are broken down into smaller, independent services that communicate over REST APIs. Unit testing is essential for ensuring the functionality of each service.

• Microservices architecture involves breaking down applications into smaller, independent services that can be developed, deployed, and scaled independently.

• REST APIs are commonly used for communication between microservices, allowing them to interact wit...read more

Amplification is the process of increasing the magnitude of a signal.

• Amplification is commonly used in audio systems to increase the volume of sound.

• It can also refer to the process of increasing the power of an electrical signal.

• Amplification can be achieved through the use of amplifiers or other electronic devices.

• In genetics, amplification refers to the process of making multiple copies of a specific DNA sequence.

• Amplification can also occur in natural phenomena, such as t...read more

The lowest common ancestor of two nodes in a tree is the node that is the closest ancestor to both nodes.

• Traverse the tree from the root to find the paths from the root to each node.

• Compare the paths to find the last common node between the two paths.

• The last common node is the lowest common ancestor.

To determine if a number is prime, check if it is divisible by any number other than 1 and itself.

• Check if the number is less than 2, if so it is not prime

• Loop through numbers from 2 to the square root of the number and check for divisibility

• If the number is only divisible by 1 and itself, it is prime

Check if a string is a palindrome by comparing characters from start and end.

• Iterate through the string from start and end simultaneously.

• Compare characters at each position, moving towards the center.

• If all characters match, the string is a palindrome.

• Example: 'racecar' is a palindrome, 'hello' is not.

Merge is used to combine two or more sets of data into a single set.

• Merge is commonly used in version control systems to combine different branches of code.

• It is also used in databases to combine data from multiple tables.

• Merge can be used in sorting algorithms to combine two sorted arrays into a single sorted array.

Modulation is the process of varying a signal's characteristics to transmit information.

• Modulation is used in various communication systems to transmit information over a distance.

• It involves varying one or more of the signal's properties such as amplitude, frequency, or phase.

• Examples of modulation techniques include amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM).

LCA (Lowest Common Ancestor) of given nodes in a tree is the node that is the lowest common ancestor of the given nodes.

• Traverse the tree to find the paths from the root to each of the given nodes.

• Compare the paths to find the last common node, which is the LCA.

• If one of the given nodes is the ancestor of the other, return the ancestor node as the LCA.

Amplitude is the measure of the height of a wave from its resting position.

• Amplitude is the maximum displacement of a wave from its equilibrium position.

• It is measured in units of length, such as meters or feet.

• In sound waves, amplitude determines the loudness of the sound.

• In light waves, amplitude determines the brightness of the light.

• Amplitude can be positive or negative, depending on the direction of the displacement.

Defect life cycle is the process of identifying, reporting, prioritizing, fixing, and verifying defects in software.

• Defect is identified by testing or user feedback

• Defect is reported to development team

• Defect is prioritized based on severity and impact

• Defect is fixed by development team

• Defect fix is verified by testing team

• Defect is closed if verified or reopened if not fixed properly

Header files are used to declare functions, variables, and constants that are used in multiple source files.

• Header files allow for modular programming and code reuse.

• They help to avoid code duplication and reduce errors.

• Examples of header files include stdio.h, math.h, and string.h.

• Header files are included using the #include preprocessor directive.

Use is the purpose or function of something.

• Use defines the intended purpose of a product or service.

• It helps users understand how to utilize the product effectively.

• Use can also refer to the act of employing something for a specific task.

• For example, the use of a hammer is to drive nails into wood.

Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their containing scope during compilation. Closures are functions that have access to variables from their outer scope even after the outer function has finished executing.

• Hoisting moves variable and function declarations to the top of their scope.

• Closures allow functions to access variables from their outer scope.

• Example of hoisting: console.log(x); var x = 5; // Output: unde...read more

My B.Tech project was on developing a web-based e-commerce platform.

• The platform was built using PHP and MySQL.

• It had features like user authentication, product catalog, shopping cart, and payment gateway integration.

• I also implemented search and recommendation algorithms to improve user experience.

• The project was well-received and got a good grade.

• I learned a lot about web development and project management during this project.

SAP Basis is the technical foundation for SAP applications, ensuring they run smoothly and efficiently.

• SAP Basis includes tasks like system administration, monitoring, performance tuning, and managing interfaces.

• It involves configuring and managing the SAP environment, including servers, databases, and security.

• SAP Basis professionals are responsible for ensuring the overall health of the SAP system.

• Examples of SAP Basis tasks include installing software updates, troubleshoot...read more

Multithreading in Java allows multiple threads to execute concurrently, improving performance and responsiveness.

• Java provides built-in support for multithreading through the java.lang.Thread class.

• Threads can be created by extending the Thread class or implementing the Runnable interface.

• Synchronization is important to prevent race conditions and ensure thread safety.

• Java also provides high-level concurrency utilities like Executors and Thread Pools.

• Example: Creating a new t...read more

Design patterns are reusable solutions to common problems in software design.

• Design patterns provide a way to create flexible and maintainable software systems.

• They help in organizing code, improving code readability, and promoting code reusability.

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

Implement a stack that supports finding the minimum element in constant time.

• Use two stacks - one to store the actual elements and another to store the minimum values at each level.

• When pushing an element, compare it with the current minimum and push the smaller value onto the minimum stack.

• When popping an element, also pop from the minimum stack if the popped element is the current minimum.

Object-oriented programming concepts in Java focus on classes, objects, inheritance, polymorphism, and encapsulation.

• Classes are blueprints for objects

• Objects are instances of classes

• 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 necessary functionalities

Quick sort is a comparison-based sorting algorithm that uses divide and conquer strategy to sort an array.

• Divide the array into two sub-arrays based on a pivot element

• Recursively sort the sub-arrays

• Combine the sorted sub-arrays to get the final sorted array

• Example: [3, 6, 8, 10, 1, 2, 1] -> [1, 1, 2, 3, 6, 8, 10]