Cogent Data Solutions Technical Support Engineer Interview Questions and Answers

Q1. What is a pointer to pointer
Ans. 
A pointer to pointer is a variable that stores the memory address of another pointer variable.
• It is used to create dynamic data structures like linked lists and trees.

• It allows multiple levels of indirection.

• It is denoted by ** in C and C++.

• Example: int **ptr;

• Example: ptr = &p; where p is a pointer variable.
Answered by AI
Add your answer
Q2. Class, object, inheritance, polymorphism,dbms
Add your answer

Q1. What are the main principles of the Java
Ans. 
Main principles of Java include object-oriented programming, platform independence, and automatic memory management.
• Object-oriented programming: Java is based on classes and objects, allowing for encapsulation, inheritance, and polymorphism.

• Platform independence: Java code can run on any platform that has a Java Virtual Machine (JVM) installed.

• Automatic memory management: Java uses garbage collection to automatically m
Answered by AI
Add your answer
Q2. What is the different between == and equals method
Ans. 
The == operator compares the memory addresses of two objects, while the equals method compares the content of two objects.
• The == operator is used to compare the memory addresses of two objects in Java.

• The equals method is used to compare the content of two objects in Java.

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will return false, but str1.equals(str2) will return true
Answered by AI
Add your answer

Q1. What is jdk, string related questions, basic java oops questions?
Add your answer

Array and OOPS concept. Given set of questions to solve with each oops concept

Q1. Out of box thinking. Given logical puzzles and ask you to analyze and provide your understanding
Add your answer
Q2. Explain the inheritance concept with car model
Ans. 
Inheritance in car model refers to the ability of a new car model to inherit features and characteristics from an existing car model.
• Inheritance allows for the creation of a new car model that shares common features with an existing car model

• The new car model can add or modify features inherited from the existing car model

• For example, a new sports car model can inherit features from a base car model such as engine, tra...read more
Answered by AI
Add your answer
Q3. Probability question with fruits and boxes
Add your answer

Just some internet questions.

Problem solving and coding in js

Q1. Problem-solving using Java.
Add your answer
Q2. SQL queries to solve problems.
Add your answer

Q1. SQL and Java basics. Write some code to solve problems.
Add your answer
Q2. System design problems
Ans. 
System design problems involve designing scalable and efficient software systems.
• Consider scalability, reliability, and performance requirements

• Break down the system into smaller components and define their interactions

• Choose appropriate technologies and architecture patterns

• Optimize for performance and consider fault tolerance

• Consider data storage, caching, and load balancing strategies
Answered by AI
Add your answer

Q1. Behavioral questions, general talks. Interests and passion for software development.
Add your answer
Q2. Talks about the product and salary discsussion
Add your answer

Q1. Personal questions and about the company.
Add your answer
Q2. Discussion on company culture and benefits.
Add your answer

Q1. Basic DSA. Array and String
Add your answer
Q2. Salary negotiation.
Add your answer