10+ Servel India Interview Questions and Answers

C++ program to reverse a string

• Use a loop to iterate through the string

• Swap the characters at the beginning and end of the string

• Continue swapping until the middle of the string is reached

A Python list is implemented as a dynamic array that can resize itself as needed.

• Python lists are implemented as dynamic arrays, allowing for efficient insertion and deletion operations.

• Lists in Python can hold elements of different data types.

• Lists can be accessed using index values, starting from 0.

• Example: my_list = [1, 'hello', True]

C is a procedural language while C++ is an object-oriented language.

• C does not support classes and objects while C++ does.

• C++ supports function overloading while C does not.

• C++ has a built-in exception handling mechanism while C does not.

• C++ supports namespaces while C does not.

• C++ supports references while C does not.

Polymorphism is the ability of an object to take on many forms. It has two types: compile-time and runtime polymorphism.

• Compile-time polymorphism is achieved through function overloading and operator overloading.

• Runtime polymorphism is achieved through virtual functions and function overriding.

• Polymorphism allows for code reusability and flexibility in object-oriented programming.

• Example of compile-time polymorphism: function overloading - multiple functions with the same nam...read more

Exception handling is a mechanism to handle runtime errors in a program to prevent it from crashing.

• Exceptions are objects that represent errors or unexpected events in a program.

• Try block is used to enclose the code that might throw an exception.

• Catch block is used to handle the exception if it occurs.

• Finally block is used to execute code regardless of whether an exception is thrown or not.

• Throw keyword is used to manually throw an exception.

• Example: try { // code that might...read more

Use array methods like slice or spread operator to copy one array to another without using a loop.

• Use the slice method: let newArray = oldArray.slice()

• Use the spread operator: let newArray = [...oldArray]

• Both methods create a shallow copy of the original array

Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.

• Abstract classes can have constructors, member variables, and non-abstract methods, while interfaces cannot.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract classes are used to define a common behavior for subclasses, while interfaces are used to define a contract for classes to implement.

• Example: Abstract class 'Anim...read more

Implement a Linked List using a stack data structure

• Create a stack to store the elements of the linked list

• Push new elements onto the stack when adding to the linked list

• Pop elements from the stack when removing from the linked list

Oops concept stands for Object-Oriented Programming. It is a programming paradigm based on the concept of objects.

• Oops concept involves the use of classes and objects

• It emphasizes on encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation is the bundling of data with the methods that operate on that data

• Inheritance allows a class to inherit properties and behavior from another class

• Polymorphism allows objects to be treated as instances of their parent class

• Abst...read more

Reverse the array of strings

• Iterate through the array from the end to the beginning

• Store each element in a new array in reverse order

• Return the new array as the reversed version of the original array