I know that there's already a question asking for your favorite programming language here. I'm curious though, what's your go-to language? The two can be very different.

For example, I love Haskell. I learned it this past semester and I fell in love with it's very concise solutions and awesome syntax (I love theoretical math so something like

fib = 1 : 1 : [ f | f <- zipWith (+) fibSeq (tail fibSeq)] 

makes my inner mathematician and computer scientist jump with joy!).

However, the majority of my projects for classes and jobs have been in C/C++ & Java. As a result, most of the time when I'm testing something like an algorithm or Data Structure I go straight to C++.

What about you guys? What languages do you love and why? What about your go-to language? What language do you use most often to get things done for work or personal projects and why?

How often does a language fall into both categories??