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Persistent Systems Software Engineer Interview Questions and Answers
84 Interview questions
The task is to count and eliminate duplicate letters from a string, returning only unique characters.
Use a set to track unique characters as you iterate through the string.
For each character, check if it is already in the set.
If not, add it to the result and the set.
Example: Input 'hello' -> Output 'helo'.
Example: Input 'programming' -> Output 'progamin'.
Find the second largest element from an integer array in a single traversal
Initialize two variables to store the largest and second largest elements
Traverse the array and update the variables accordingly
Return the second largest element
HTTP is unsecured while HTTPS is secured with SSL/TLS encryption.
HTTP stands for Hypertext Transfer Protocol while HTTPS stands for Hypertext Transfer Protocol Secure.
HTTP operates on port 80 while HTTPS operates on port 443.
HTTP is vulnerable to attacks while HTTPS is secure due to SSL/TLS encryption.
HTTPS is indicated by a padlock icon in the browser's address bar.
HTTPS is used for secure online transactions suc...
DML, DDL, and TCL are types of SQL commands used to manipulate databases.
DML (Data Manipulation Language) is used to manipulate data in a database, such as inserting, updating, and deleting records.
DDL (Data Definition Language) is used to define the structure of a database, such as creating tables, indexes, and constraints.
TCL (Transaction Control Language) is used to manage transactions in a database, such as co...
Function overloading is having multiple functions with the same name but different parameters. Function overriding is having a function in a subclass with the same name and parameters as a function in the superclass.
Function overloading is a compile-time polymorphism concept.
Function overriding is a runtime polymorphism concept.
Function overloading is used to provide different implementations of the same function ...
Java is platform independent while C++ is not.
Java code is compiled into bytecode which can run on any platform with a JVM, while C++ code needs to be compiled separately for each platform.
Java has automatic memory management through garbage collection, while C++ requires manual memory management.
Java has built-in support for multithreading, while C++ requires external libraries.
Java has a simpler syntax and is ea...
Public and private IP addresses are used in computer networks. Public IPs are globally unique and accessible from the internet, while private IPs are used within a local network.
Public IP is assigned by the Internet Service Provider (ISP) and is used to identify a device on the internet.
Private IP is assigned by a local network administrator and is used to identify a device within a local network.
Public IPs are gl...
C is a procedural programming language while C++ is an object-oriented programming language.
C is a procedural programming language, meaning it focuses on procedures or functions.
C++ is an extension of C and adds object-oriented features like classes and inheritance.
C++ supports polymorphism, encapsulation, and abstraction, which C lacks.
C++ allows the use of standard template library (STL) for data structures and ...
Prediction uses data analysis and statistical models to forecast future outcomes.
Prediction involves collecting and analyzing data to identify patterns and trends.
Statistical models are then used to make predictions based on the identified patterns.
Predictions can be made for a wide range of applications, such as weather forecasting, stock market trends, and customer behavior.
Accuracy of predictions can be improve...
Banker's algorithm is a resource allocation and deadlock avoidance algorithm used in operating systems.
It is used to prevent deadlocks by ensuring that the system never enters an unsafe state.
It works by simulating the allocation of resources and checking if the system will remain in a safe state.
It requires knowledge of the maximum resource needs of each process and the currently available resources.
If a request ...
Persistent Systems Software Engineer Interview Experiences
129 interviews found
Anonymous
Basic MCQs on General aptitude, logical reasoning and programming questions
(5 Questions)
- Q1. What is a constructor in C++?
- Q2. What is copy assignment operator?
- Ans.
Copy assignment operator is a special member function in C++ that allows one object to be assigned the values of another object of the same class.
Copy assignment operator is denoted by the = operator.
It is used to copy the values of one object into another object of the same class.
It is automatically generated by the compiler if not explicitly defined.
Example: MyClass obj1; MyClass obj2; obj2 = obj1; // Copy assignment...
- Q3. What is virtualization in C++?
- Ans.
Virtualization in C++ is the process of creating a virtual version of a class or function to allow for polymorphism and dynamic binding.
Virtualization in C++ is achieved through the use of virtual functions and inheritance.
Virtual functions are declared in a base class and overridden in derived classes to provide different implementations.
Virtualization allows for polymorphism, where a pointer to a base class can point...
- Q4. Implement String class
- Q5. What is smart pointers?
Skills evaluated in this interview
Selected
I applied via Campus Placement and was interviewed in Sep 2024. There were 3 interview rounds.
Aptitude, Technical MCQs
(3 Questions)
- Q1. Question on arrays
- Q2. Discussion about projects
- Q3. Calculator Program
- Ans.
A calculator program performs basic arithmetic operations like addition, subtraction, multiplication, and division.
Implement functions for each operation: add, subtract, multiply, divide.
Example: add(5, 3) returns 8.
Handle edge cases like division by zero.
Consider user input validation for robustness.
(2 Questions)
- Q1. Tell me about yourself
- Q2. Which technology are you interested to work in
- Ans.
I am interested in working with artificial intelligence and machine learning technologies.
Artificial Intelligence
Machine Learning
Natural Language Processing
Computer Vision
Pavan Kumar
I applied via Campus Placement
Aptitude exam and coding test
(2 Questions)
- Q1. Datatypes in java
- Ans.
Java has various datatypes like int, double, boolean, etc. to store different types of values.
Primitive datatypes include int, double, boolean, char, etc.
Reference datatypes include classes, interfaces, arrays, etc.
Examples: int num = 10; double price = 19.99; boolean isTrue = true;
- Q2. Write a star program
Skills evaluated in this interview
nl vinay kumar
Aptitude and two questions were there
(2 Questions)
- Q1. Oops concepts and sql
- Q2. Coding questions was asked to solve
You need to be very sharp. The question can be based on any DSA topic.
(5 Questions)
- Q1. The question will be related to your technology that you mention in your resume.
- Q2. First question was related to tree.
- Q3. It can be related to database.
- Q4. Software engineering
- Q5. Programming language
(2 Questions)
- Q1. Sql questions were asked
- Q2. Project questions were asked
Selected
I applied via Campus Placement and was interviewed in Mar 2024. There were 4 interview rounds.
It was Aptitude+Coding test for the fundamentals of Computers related topics such as CN,OS,SDLC,OOPS,DBMS,etc
(1 Question)
- Q1. It is technical1 and basically it was depends on your working technology such as python(MY ONE),OOPS concepts ,SQL as well as basic coding in data structures like Linked list,Searching techniques and too m...
(1 Question)
- Q1. It is technical2 and precisely on Some HR as well as project oriented questions to check our programming skills application in real-life.
(1 Question)
- Q1. Tell me about yourself? Tell me your hobbies? Why we choose you? Why persistent?
Interview Preparation Tips
- Computer Networking
- Python
- DSA
- OS
- SDLC
Selected
I appeared for an interview in Feb 2025, where I was asked the following questions.
- Q1. Tell me about yourself
- Q2. Python basic questions
Gurdeep Singh
Aptitude test normal questions
(2 Questions)
- Q1. Basic Question on Arrays
- Q2. Basic questions on string manipulation
(2 Questions)
- Q1. Internal Working of HashMap
- Ans.
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
HashMap internally uses an array of linked lists to store key-value pairs.
When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.
If multiple keys hash to the same index, a linked list is used to handle collisions.
To retrieve a value, the key is hashed a...
- Q2. Core Java Questions
Skills evaluated in this interview
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