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- Take some time to learn some CS fundamentals.
- Make sure you know a language that someone that might employ you knows (just so they have a point of reference).
- Write some toy applications in the field you want to move to.
It is very easy for a physical scientist to write Fortran that performs well - the syntax looks very similar to the maths that is being modeled. It is a lot harder for a scientist to write tight C code.
2. As a research student your first program is likely to be a F77 program written by your professor or an older colleague.
3. A library from 30 years ago can be easily wrapped into a modern program, compiled and run.
4. Arrays are really the most important thing for this sort of programming and since F90 array level operations have been baked into the language.
5. It is fairly trivial to write fast Fortran.
6. Fortran is much easier to use for numerical stuff than c++