Cognizant Junior Software Engineer Interview Questions and Answers

Q1. Oops in cpp programing
Ans. 
In C++, 'oops' typically refers to Object-Oriented Programming concepts and principles.
• Oops in C++ refers to Object-Oriented Programming concepts like classes, objects, inheritance, polymorphism, and encapsulation.

• Common mistakes in C++ programming include memory leaks, null pointer dereferencing, and improper use of pointers.

• Example: Forgetting to delete dynamically allocated memory can lead to memory leaks in C++ pro...read more
Answered by AI
Add your answer
Q2. What is generic in cpp
Ans. 
Generics in C++ allow for writing generic algorithms and data structures that work with any data type.
• Generics in C++ are implemented using templates, which allow for writing code that can work with any data type.

• Templates are a way to create generic functions or classes without specifying the data type.

• For example, a generic function to find the maximum of two values can be written using templates.

• Another example is a...read more
Answered by AI
Add your answer

Q1. What is oops concepts?
Ans. 
Object-oriented programming concepts that focus on objects and classes for code organization and reusability.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details an...read more
Answered by AI
Add your answer
Q2. Write a programof palindrome of string?
Ans. 
A program to check if a given string is a palindrome or not.
• Create a function that takes a string as input.

• Reverse the string and compare it with the original string.

• If they are the same, then the string is a palindrome.

• Examples: 'madam' is a palindrome, 'hello' is not a palindrome.
Answered by AI
Add your answer

Q1. Define the Oops pillars.
Ans. 
Oops pillars are the four main principles of object-oriented programming: Inheritance, Encapsulation, Abstraction, and Polymorphism.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Abstraction: Hiding the complex implementation details and showing only the necessary features of an object.

• Polymorphism: A...read more
Answered by AI
Add your answer
Q2. Define 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 uses an array to store key-value pairs.

• Keys are hashed to determine the index where the value will be stored.

• Collision handling techniques like chaining or open addressing are used to deal with multiple keys hashing to the same index.

• Retrieving a value involves hashing the key to find the index and ...read more
Answered by AI
Add your answer
Q3. Define multi threading & synchronisation
Ans. 
Multithreading is the ability of a CPU to execute multiple threads concurrently, while synchronization is the coordination of multiple threads to ensure data consistency.
• Multithreading allows multiple threads to run concurrently on a single CPU core.

• Synchronization is used to coordinate access to shared resources among multiple threads.

• Examples of synchronization mechanisms include locks, semaphores, and monitors.

• Multi...read more
Answered by AI
Add your answer
Q4. Difference between abstract class & functional interface
Ans. 
Abstract class can have both abstract and non-abstract methods, while functional interface can have only one abstract method.
• Abstract class can have constructors, fields, and methods, while functional interface can only have one abstract method.

• Abstract class can have abstract and non-abstract methods, while functional interface can only have one abstract method.

• Abstract class can provide default implementations for me...read more
Answered by AI
Add your answer

It was a decent aptitude test if you practice well you can clear it.

In coding test they asked about oops concepts and said to code.And all the basic programming questions.

Second largest number in array

Q1. Sort array using stream api
Ans. 
Sort array of strings using Java Stream API
• Use Arrays.stream() to convert array to stream

• Use sorted() method to sort the stream

• Use collect() method to convert the sorted stream back to array
Answered by AI
Add your answer
Q2. Reverse a string
Ans. 
Reverse a given string
• Use a loop to iterate through the characters of the string

• Swap the characters from start to end of the string

• Repeat until the entire string is reversed
Answered by AI
Add your answer

Q1. Introduce yourself
Add your answer
Q2. Strength and weakness
Add your answer

Normal aptitude questions were asked

Ques from java, sql were asked