Microsoft Software Engineer - Internship interview questions

On-campus whiteboard interview, 4 on-site interviews in one day at Redmond, WA office. All the questions were pretty average coding questions that taking data structures and algorithms classes would prepare you for, or reading Cracking the Coding Interview

Was contacted by the recruiter a day after submitting my application online. The first round was a 30 min on-campus interview. Mostly behavioral questions and one technical question which was something along the lines of reversing every word in a string. The interviewer was friendly. Got selected for the second round of interview at Redmond. There were 4 back to back interviews. The first was an easy programming question about vectors/arrays. But it had a lot of edge cases to cover and the interviewer expected me to ask a lot of questions. The second interview involved thinking about how the touchButton function works internally in iOS app dev and reading some C# code (you were allowed to ask him questions on the syntax). The third round had a design question. The first three rounds were not that hard. The fourth interview was completely random though. It involved OS and ML concepts - classes that I have not taken yet (The interviewer had any idea about my skills and resume).