Nobody worth their salt knows only 1 language.
How true. The real question is do you pick JAVA or C for your data structures and algorithms courses. Once you learn one of those, you’ll pick up the others as you start following your interests. Client-side programming? Javascript. Server-side programming? PHP, Python or Ruby. Database interfacing? SQL for traditional databases, or MongoDB for high-volume databases with large amounts of data per record.
What’s more interesting is what’s NOT on the list, or dropping off like mad: Perl (dying, faced with competition from Python and Ruby; employers learned that Perl code meant no-one but the original programmer could work on a module), VB.NET and JAVA.NET (People who use .NET use C#.NET), ActiveScript (even if you use .NET, there’s no reason not to use JavaScript), FORTRAN and COBOL (anyone who uses them still has their employees from BEFORE the economic crash; no-one was dumb enough to lay the off.)
That’s true. I probably should have made that point as well.