Railtel Corporation Of India Engineer Interview Questions and Answers

Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types or classes.

• Examples include method overloading and method overriding in object-oriented programming.

Find missing number from nth number array.

• Iterate through the array and calculate the sum of all numbers

• Calculate the sum of numbers from 1 to n using the formula n*(n+1)/2

• Subtract the sum of array from the sum of numbers from 1 to n to find the missing number

Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.

• Inheritance allows a class to reuse code from another class.

• Types of inheritance include single inheritance, where a class inherits from only one parent class, and multiple inheritance, where a class inherits from multiple parent classes.

• Example: Class B inherits from Class A, so Class B can access

Find 2nd max element from array of strings

• Sort the array in descending order

• Skip the first element (max element)

• Return the second element

Interprocess communication involves various mechanisms like pipes, sockets, shared memory, etc. Goroutines communicate using channels and shared memory.

• Interprocess communication can be achieved through mechanisms like pipes, sockets, shared memory, message queues, etc.

• Goroutines in Go communicate internally using channels, which are typed conduits through which you can send and receive values.

• Shared memory can also be...read more

Design a URL shortener service

• Generate a unique short code for each URL

• Store the mapping of short code to original URL in a database

• Redirect users from short URL to original URL

• Consider scalability and performance of the service

• Implement analytics to track usage statistics