MATLAB is powerful and simple to learn, but often too slow for intensive calculations.
FORTRAN is often joked about for being outdated but its use is pretty widespread in many complex engineering applications. I would recommend this over C or C++. I think it is a little easier to pick up (although C++ was my first language so maybe that was why it took a little longer for me to use proficiently) and very powerful.

How to use VaZing’s HVAC Software Dispatch Board

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