Are you asking what computer language you should learn? I'd say go for Java or C/C++. Java would be easier than C or Cpp because Java is multi-platform for one, and you don't have to deal with a lot of the weird quirky things that are in C. FORTRAN may also be useful, engineers and scientists still use it despite better options. Once you learn one language, the others will be a simple matter of learning structure and syntax.
I don't know if you know but usually it's also a good idea to take classes on applied or numerical methods (mathematics course usually) so that it shows you how to do the math side of computational fields (like finance, biology, genetics, physics, etc.).