Walmart Programmer interview questions

I received a phone call from a recruiter asking me to come in for an interview and have dinner. They had gotten my resume from the campus career center so it was an out-of-the-blue surprise for me. Dinner was at a nice place and was very informational. The next Day I came to the interview and my interviewers were the ones sitting across from me during dinner. Overall fairly relaxed interview. Typical why us questions and such. Asked the difference between a For and a While loop. What is a switch case, which is faster between a switch case and a series of if-else statements.