Cognizant Programmer Analyst Interview Questions, Process, and Tips

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Q1. What is abstract class
Ans. 
Abstract class is a class that cannot be instantiated and may contain abstract methods.
• Cannot be instantiated directly

• May contain abstract methods that must be implemented by subclasses

• Can have both abstract and non-abstract methods

• Used for creating a template for other classes to inherit from
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Q2. What exception handling
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Exception handling is a programming concept that deals with errors and unexpected events in a program.
• Exception handling allows programmers to gracefully handle errors and prevent program crashes.

• It involves using try, catch, and finally blocks to handle exceptions.

• Examples of exceptions include divide by zero, file not found, and out of memory errors.
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Q3. Difference between list and array
Ans. 
Arrays are fixed in size and store elements of the same data type, while lists can dynamically resize and store elements of different data types.
• Arrays have a fixed size, while lists can dynamically resize.

• Arrays store elements of the same data type, while lists can store elements of different data types.

• Arrays use contiguous memory allocation, while lists use linked data structures.

• Arrays are accessed by index, while
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Q1. What's your expectations
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Aptitude test 2 hours

Q1. Programming questions and their logic
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Q2. Code logic for a specific function
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Code logic for a specific function
• Identify the input parameters required for the function

• Define the steps needed to achieve the desired output

• Consider edge cases and error handling

• Test the function with different inputs to ensure correctness
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Q1. Intro about myself
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Q2. Background qns to know more about myself
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Q1. Opps concept related questions
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Q2. Sql releted questions
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Basic Aptitude Question

Q1. Java Basics Interview Question
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Q2. Learn Basics Coding
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Q3. Be Confident and Happy Mood
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Q4. Be Ready with Interview Question
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Q1. Location and Address and Adhar And Pan Card Details
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HACKERRANK TEST WAS CONDUCTED FOR TESTING THE KNOWLEDGE IN REACT.JS AS I BELONG TO THAT FIELD.

Q1. What project you were in ?
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Q2. What was your day to day role in that project?
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Q3. Two defined table and fetching data is done one table has 20 records of 20 students another table has 10 student information if i want to pick the common record how to pick?
Ans. 
Use SQL JOIN to fetch common records from two tables.
• Use SQL JOIN to combine the two tables based on a common column (e.g. student ID).

• Select the columns you want to retrieve from both tables.

• Use the WHERE clause to filter out the records that are common between the two tables.
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Q4. Difference between sql and sql server?
Ans. 
SQL is a language used to manage databases, while SQL Server is a Microsoft product that includes a database management system.
• SQL is a language used to interact with databases, while SQL Server is a Microsoft product that includes a database management system.

• SQL can be used with various database management systems like MySQL, Oracle, etc., while SQL Server is specific to Microsoft.

• SQL is a standard language for query...read more
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Q5. Question related to Joins?
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Q6. If i want to select uncommon records which does not match how to pick?
Ans. 
To select uncommon records that do not match, use the NOT IN or NOT EXISTS clause in SQL.
• Use the NOT IN clause to select records that do not match a specific list of values.

• Use the NOT EXISTS clause to select records that do not have a matching record in a subquery.

• Example: SELECT * FROM table_name WHERE column_name NOT IN (value1, value2);

• Example: SELECT * FROM table1 WHERE NOT EXISTS (SELECT * FROM table2 WHERE table
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Q7. Explain react in website making?
Ans. 
React is a JavaScript library for building user interfaces.
• React allows developers to create reusable UI components.

• It uses a virtual DOM for efficient rendering.

• React can be used to build single-page applications.

• React is maintained by Facebook and a community of developers.

• React can be combined with other libraries like Redux for state management.
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Q8. How to add moving images in flipkart?
Ans. 
Moving images can be added in Flipkart by using HTML and CSS animations.
• Use HTML tag to insert the image

• Apply CSS animations to create the moving effect

• Use keyframes to define the animation behavior
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Q1. OOPs concept in java
Ans. 
OOPs concept in Java refers to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.
• Java supports OOPs concepts like inheritance, where a class can inherit properties and behaviors from another class.

• Encapsulation in Java involves bundling data and methods within a class to restrict access from outside.

• Polymorphism allows objects to be treated as instances of their paren...read more
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Q2. Sql Joins related questions
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