Cognizant Junior Software Developer Interview Questions and Answers

Q1. What are the advantages of using Spring Boot?
Ans. 
Spring Boot simplifies Java development with rapid setup, built-in features, and microservices support.
• Rapid Development: Spring Boot allows developers to create stand-alone applications quickly with minimal configuration.

• Convention over Configuration: It provides sensible defaults, reducing the need for extensive XML configuration.

• Embedded Servers: Spring Boot includes embedded servers like Tomcat and Jetty, enabling ...read more
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Q2. What is the difference between a Controller and a Rest Controller in the context of web applications?
Ans. 
A Controller handles web requests, while a Rest Controller specifically manages RESTful web services.
• A Controller typically returns views (HTML) for web applications.

• A Rest Controller returns data (JSON/XML) for APIs.

• Example of Controller: @Controller in Spring MVC.

• Example of Rest Controller: @RestController in Spring Boot.

• Rest Controllers are stateless and focus on resource representation.
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Q1. Basics of C language.
Ans. C language is a procedural oriented language,rich In library, Feature of modularity,easy to extend, memory management language.
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Q2. What is input and output functions used in c language,..ect
Ans. 
Input and output functions in C language are used to interact with the user and the external environment.
• Input functions in C include scanf() for reading input from the user and getchar() for reading a single character.

• Output functions in C include printf() for displaying output to the user and putchar() for displaying a single character.

• File input and output functions in C include fopen(), fclose(), fread(), and fwrit...read more
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Q3. What are header files,and use .?
Ans. 
Header files contain declarations of functions, variables, and constants used in a program.
• Header files are included in source code files using #include directive.

• They help in organizing code by separating declarations from implementation.

• Common header files in C/C++ include , , and .
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Q4. Datatypes in c language.
Ans. 
Datatypes in C language include int, float, char, double, and more.
• Basic datatypes: int, float, char, double

• Derived datatypes: arrays, pointers, structures, unions

• Enumerated datatypes: enum

• Void datatype: void

• Example: int num = 10; char letter = 'A'; float value = 3.14;
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Easy and all were based upon the logics

It was moderate level where 2 coding questions and 2 sql questions where asked.

Q1. What is database
Ans. 
A database is a structured collection of data that is organized in a way to easily access, manage, and update information.
• Database stores data in tables with rows and columns.

• It allows for efficient retrieval, insertion, and updating of data.

• Examples include MySQL, PostgreSQL, MongoDB.
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Q2. How many types of database
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There are mainly four types of databases: relational, NoSQL, object-oriented, and graph databases.
• Relational databases: store data in tables with rows and columns (e.g. MySQL, PostgreSQL)

• NoSQL databases: store data in non-tabular format, suitable for large amounts of data (e.g. MongoDB, Cassandra)

• Object-oriented databases: store data as objects, allowing for complex data structures (e.g. db4o)

• Graph databases: store dat...read more
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Work time aptitute questions

Switch two variable without 3rd variable

Q1. Why would you like to join cognizant
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