Dell Storage Engineer Interview Questions and Answers

I rate myself 2 in C, 3 in C++ and 4 in DS.

• I have a good understanding of basic concepts in C and can write simple programs.

• I have worked on projects in C++ and have a decent knowledge of OOP concepts.

• I am comfortable with data structures like arrays, linked lists, stacks, and queues.

Storage classes in C define the scope and lifetime of variables.

• There are four storage classes in C: auto, register, static, and extern.

• Auto variables are local to a block and have automatic storage duration.

• Register variables are stored in CPU registers for faster access.

• Static variables have a lifetime throughout the program and are initialized only once.

• Extern variables are declared outside any function and can be a

C program to reverse a string in-place

• Use two pointers, one at the beginning and one at the end of the string

• Swap the characters at the two pointers and move the pointers towards each other until they meet

• Handle odd-length strings by leaving the middle character in place

Program to insert a node in linked list

• Create a new node with the given data

• Set the next pointer of the new node to the next pointer of the previous node

• Set the next pointer of the previous node to the new node

Program to find loop in linked list

• Use two pointers, slow and fast, to traverse the linked list

• If there is a loop, the fast pointer will eventually catch up to the slow pointer

• To find the start of the loop, reset the slow pointer to the head and move both pointers at the same pace

Quick sort is a divide and conquer algorithm that sorts an array by partitioning it into two sub-arrays.

• Choose a pivot element from the array

• Partition the array around the pivot element

• Recursively apply the above steps to the sub-arrays

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

Heap sort is a comparison-based sorting algorithm that uses a binary heap data structure.

• Heap sort works by building a binary heap from the array to be sorted.

• The largest element is then swapped with the root node and removed from the heap.

• The heap is then restructured and the process is repeated until the array is sorted.

• Heap sort has a time complexity of O(n log n) and is not stable.

• It is often used in embedded syste...read more

C++ is a high-level programming language used for developing system software, application software, device drivers, and video games.

• C++ was developed by Bjarne Stroustrup in 1983.

• It is an extension of the C programming language.

• C++ supports object-oriented programming, generic programming, and low-level memory manipulation.

• It is widely used in industries such as finance, gaming, and operating systems development.

• Exampl...read more

OOP stands for Object-Oriented Programming, a programming paradigm that focuses on objects and their interactions.

• OOP is based on the concepts of encapsulation, inheritance, and polymorphism.

• It allows for modular and reusable code.

• Examples of OOP languages include Java, C++, and Python.

Which software are you referring to?

• Please specify the software you are asking about

• Without context, it is impossible to answer this question

Late binding is a programming concept where the method or function to be executed is determined at runtime.

• Also known as dynamic binding or runtime binding

• Allows for greater flexibility in code execution

• Commonly used in object-oriented programming languages

• Example: virtual functions in C++

Virtual functions are functions that can be overridden by derived classes.

• Virtual functions are declared in a base class and can be overridden in a derived class.

• They allow for polymorphism, where a derived class can be treated as its base class.

• Virtual functions are called based on the actual object type, not the pointer or reference type.

• They are declared using the 'virtual' keyword in the base class and optionally o...read more

A friend class is a class that is granted access to the private and protected members of another class.

• A friend class is declared using the 'friend' keyword.

• A friend class can access private and protected members of the class that granted it friendship.

• Friendship is not mutual, meaning the friend class does not grant access to its own members.

• Friend functions can also be declared in a class to grant access to private a

++x is faster than x++ because it increments the value before using it.

• ++x increments the value before using it, while x++ increments the value after using it.

• ++x is faster because it saves the overhead of creating a temporary variable.

• In some cases, the difference in speed may be negligible and the choice between the two may depend on readability and coding standards.

A null object is an object that does not have a value or reference to any object.

• A null object is different from an object with a value of zero or an empty string.

• It is often used to represent the absence of an object or value.

• Null objects can be used to avoid null pointer exceptions in programming.

• It is a conceptual idea in programming and computer science.

I am a software engineer with experience in developing web applications and mobile apps.

• Proficient in programming languages such as Java, Python, and JavaScript

• Skilled in using frameworks like React, Angular, and Spring Boot

• Experience in working with databases such as MySQL and MongoDB

• Familiarity with agile development methodologies

• Passionate about learning new technologies and solving complex problems

My strength is my ability to quickly learn and adapt to new technologies and programming languages.

• Quick learner and adaptable to new technologies

• Able to work with multiple programming languages

• Strong problem-solving skills

• Attention to detail

• Good communication skills

I need to improve my time management skills.

• Prioritize tasks based on urgency and importance

• Set realistic deadlines and stick to them

• Avoid multitasking and focus on one task at a time

• Use tools like calendars and to-do lists to stay organized

Yes, I am okay with the job location in Noida.

• I am willing to relocate for the right opportunity

• I have researched the area and feel comfortable with the location

• I am excited about the opportunity to work with this company and location is not a major factor

Samsung is a South Korean multinational conglomerate known for its electronics, appliances, and smartphones.

• Founded in 1938 by Lee Byung-chul

• Employs over 300,000 people worldwide

• Produces a wide range of products including TVs, refrigerators, washing machines, and smartphones

• One of the largest smartphone manufacturers in the world

• Has a strong focus on innovation and research and development

I am excited about the company's innovative projects and the opportunity to work with a talented team.

• I am impressed by the company's reputation in the industry

• I am excited about the company's focus on innovation and cutting-edge technology

• I am eager to work with a talented team and learn from experienced professionals

• I believe that my skills and experience align well with the company's needs

I have the technical skills, experience, and passion to contribute to your team and help drive success.

• I have a strong background in software development, with expertise in multiple programming languages and frameworks.

• I am a quick learner and adaptable to new technologies and methodologies.

• I have experience working in both individual and team settings, and am able to communicate effectively with colleagues and stakeho...read more

I'm sorry, I don't understand the question. Could you please clarify?

• Please provide more context or rephrase the question.

• I'm not sure what 'giving cat' means in this context.

• Could you please explain what you are looking for?

I chose VJTI because of its reputation for excellence in engineering education.

• VJTI has a long history of producing successful engineers.

• The faculty at VJTI are highly experienced and knowledgeable.

• VJTI has state-of-the-art facilities and resources for engineering students.

• The alumni network of VJTI is strong and provides great opportunities for networking and career growth.

I prefer jobs in other locations due to personal reasons and career goals.

• Personal reasons such as family or lifestyle preferences

• Career goals such as industry focus or company culture

• Other locations may offer better opportunities or work-life balance

• Preference for smaller or emerging tech hubs

• Examples: Hyderabad, Chennai, Mumbai, Delhi

Operating system uses memory protection to prevent modification of const variables like const int i=5;

• Operating system marks the memory page containing i as read-only

• Any attempt to modify i will result in a segmentation fault

• Compiler may optimize code by replacing i with its value at compile time

Explanation of memory layout in main memory of computer system.

• Main memory is divided into four segments: stack, heap, data, and code.

• Stack stores local variables and function calls.

• Heap stores dynamically allocated memory.

• Data stores global and static variables.

• Code stores the program instructions.

• Example: int x; //stored in data segment, int *p = new int; //stored in heap segment

Two methods to allocate memory in C are malloc and calloc. Malloc allocates memory block of given size while calloc initializes the allocated memory block to zero.

• Malloc allocates memory block of given size while calloc initializes the allocated memory block to zero.

• Malloc returns a pointer to the first byte of allocated memory block while calloc returns a pointer to the first byte of initialized memory block.

• Malloc is...read more

new() is an operator in C++ used for dynamic memory allocation.

• new() returns a pointer to the allocated memory.

• It can be used to allocate memory for primitive data types, arrays, and objects.

• Memory allocated using new() must be deallocated using delete operator.

• Example: int *ptr = new int;

• Example: int *arr = new int[10];

• Example: MyClass *obj = new MyClass();

malloc and new are used to allocate memory dynamically. Malloc is faster but new is safer.

• malloc is a C function while new is a C++ operator

• malloc only allocates memory while new also initializes the memory

• new throws an exception if allocation fails while malloc returns NULL

• malloc is faster because it does not involve constructor calls

• new is safer because it ensures type safety and prevents memory leaks

extern and static are storage classes in C programming language.

• extern is used to declare a variable or function that is defined in another file or module.

• static is used to declare a variable or function that is local to a file or module.

• Example of extern: extern int count; //declares count variable defined in another file.

• Example of static: static int count = 0; //declares count variable local to the file.

The two statements are equivalent and declare a pointer to a constant integer.

• Both statements declare a pointer to an integer that cannot be modified through the pointer.

• The 'const' keyword can be placed before or after the 'int' keyword.

• The pointer itself can still be modified to point to a different integer.

• Example: const int *p; and int const *p; both declare a pointer to a constant integer.

Cannot modify value pointed by p, but can change the address it points to.

• p is a pointer to a constant integer with value 5

• a) is valid as p can point to a non-constant integer

• b) is invalid as *p is a constant and cannot be modified

Self referential structure is a structure that contains a pointer to the same type of structure.

• It allows a structure to reference itself within its own definition.

• It is commonly used in linked lists, trees, and graphs.

• Example: struct Node { int data; struct Node *next; };

• Here, the Node structure contains a pointer to another Node structure.

Structure and union are data structures in C language. Union stores only one value at a time while structure stores multiple values.

• Structure is used to store different data types while union is used to store only one data type at a time.

• Structure allocates memory for all its members while union allocates memory for only the largest member.

• Structure is used when we want to store multiple values of different data types ...read more

Structure byte padding is the insertion of unused bytes between structure members to align them in memory.

• Padding is added to ensure that each member of a structure is aligned on a memory boundary that is a multiple of its size.

• The amount of padding added depends on the size and alignment requirements of the members.

• Padding can affect the size of a structure and the performance of code that uses it.

• For example, a struc...read more

To check if a linked list is circular, we can use Floyd's cycle-finding algorithm.

• Floyd's cycle-finding algorithm uses two pointers, one moving at twice the speed of the other.

• If the linked list is circular, the fast pointer will eventually catch up to the slow pointer.

• If the linked list is not circular, the fast pointer will reach the end of the list and the algorithm will terminate.

Windows is a proprietary operating system developed by Microsoft.

• Windows is a graphical user interface (GUI) based operating system.

• It is designed to run on personal computers, servers, and mobile devices.

• Windows has different versions such as Windows 10, Windows 8, Windows 7, etc.

• It supports a wide range of software applications and hardware devices.

• Windows is known for its ease of use and user-friendly interface.

UNIX is an operating system developed in the 1970s, while LINUX is a free and open-source operating system based on UNIX.

• UNIX is proprietary, while LINUX is open-source

• UNIX is older and has a longer history, while LINUX is a newer development

• UNIX is more stable and reliable, while LINUX is more customizable and flexible

• UNIX has a more limited user base, while LINUX has a larger and more active community

• Examples of UNIX...read more

A real-time operating system is an OS that processes data and events as they occur, without delay.

• Real-time operating systems are used in applications that require immediate response, such as aviation, medical equipment, and industrial control systems.

• They prioritize tasks based on their urgency and importance, and can handle multiple tasks simultaneously.

• Examples of real-time operating systems include VxWorks, QNX, an

There are 6 types of CPU scheduling: FCFS, SJF, SRTF, Priority, Round Robin, and Multilevel Queue. Each has its own advantages and disadvantages.

• FCFS (First-Come-First-Serve) - processes are executed in the order they arrive

• SJF (Shortest-Job-First) - shortest job is executed first

• SRTF (Shortest-Remaining-Time-First) - preemptive version of SJF

• Priority - processes with higher priority are executed first

• Round Robin - eac...read more

No, there is no ideal CPU scheduling possible.

• CPU scheduling is a complex problem with many variables.

• Different scheduling algorithms are suited for different scenarios.

• The ideal scheduling algorithm would depend on the specific system and workload.

• For example, a real-time system would require a different scheduling algorithm than a batch processing system.

To set process priority in Windows and Linux, use task manager and nice command respectively.

• In Windows, open task manager, right-click on the process and select 'Set Priority'

• In Linux, use the 'nice' command followed by the process name or ID and the priority level (values range from -20 to 19)

• Higher priority levels mean the process will get more CPU time

• Examples: 'nice -n 10 firefox' sets Firefox priority to 10 in Li...read more

The priority of a mobile application depends on the business goals and user needs.

• The priority of a mobile application can vary depending on the business goals and user needs.

• For example, a mobile banking app may have a higher priority than a social media app for a bank.

• On the other hand, a social media app may have a higher priority for a media company.

• The priority can also depend on the target audience and the market...read more