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Delphi (respectively Kylix for Linux) is Pascal (plus some extras). I guess, it will stay for many more years.
Besides PC's and x86 processors, only a few processors are supported by pascal compilers. I think 8051, may be PIC and surely AVR with AVRco (https://www.e-lab.de/index_en.html). In contrast, any processor is supported by C-compilers. This must be considered.
A professional programmer or electronic engineer in general should be able to use any programming language after short practizing. This doesn't exclude, that one of used languages is your favourite, something like a mother tongue.
Pascal is an academic programming language i.e. it was developed specially for learning people basic concepts of programming. So it's more easy than C++ and will give you an idea of how to write programs. Using these knowledge you can learn any language you want.