I was contacted by the company HR through Naukri. They scheduled the interview within a week.

Round 1: Aptitude test (50 questions in 1 hour) Includes 25 general aptitude questions (time and work, ratio, ages, calendar, etc.) and 25 technical aptitude questions (program output, debugging the errors, questions based on OS concepts like scheduling algorithms, paging, virtual memory, etc.).

Round 2: Write 4 programs (C/Java) in 1 hour (Pen and paper).

Round 3: Technical interview (2-person panel). The interviewers were quite friendly and helpful in guiding me to find the correct answer.

Round 1: Do some research on the internet and try to understand what kind of questions are asked. The questions are simple and test the candidate's basic fundamental skills. The main thing is speed. 50 questions in 1 hour is very difficult, especially for experienced candidates who are out of touch solving aptitude questions. So, practice a lot. Give more weightage to technical questions first and then general aptitude, as time does not permit solving all.

Round 2:

1. Program to read from a file and write to another file while replacing all vowels with '*'.
2. Program to add elements to a 5*9 array in the following order: A BCD EFGHI JKLMNOP QRSTUVWXY
3. Program to reverse the digits of a number and print them.
4. Program to print the maximum occurrences of a character in a given string.

Round 3:

1. Explain the current project and questions based on that.
2. Basic C/C++ questions.
3. Lot of questions centered on bitwise operators, like: a) Toggle the bits of a number. b) Flip the first and last bit (n), second and (n-1)th bit, and so on.
4. How to optimize the programs written in Round 2.