BSCS so the usual C++,C,C#, Java, Python, Ruby, PHP, Javascript, Perl, and Prolog.
My favorite has to be Java or C# because the code writes itself.
My least favorite is Ruby or PHP.
Honorable mention to my favorites has to be LISP (particularly the Racket dist), because parentheses are cool.
I used to code in IBM 360 because the school requires assembly experience.
Finally, R is a great language that I highly recommend for anyone who is approaching computer science from a mathematical and research perspective rather than a business and IT perspective. If you are planning on going to graduate school for CS or related, you won't be sorry that you know it. I was able to use it to create charts to include in my ACM paper and get it successfully published (probably more on the content I wrote than the figures but judges like nice figures).