Does a smile from the interviewer mean you got the job? What if they say "we will contact you in a couple of days." Is there a way to determine whether or not you snagged the job?

How to Tell if You Got the Job

Have you ever walked away from an interview 100% positive you got the job? I did once, only to find out I had flunked the logic test they gave. Fortunately they let me retake it, I got the job and ended up staying 12 years!