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I get a fair amount of the theories but I apparently have the touch.

Many years ago, I took a C class and dropped it before flunking out.

The instructor would look at what I did and most should have worked. I confounded him too.

I taught an embedded systems class with 6800 and 8085 trainers for my students. I had the 6800 op codes memorized to the point that I could write the code and assemble on the white board during my lecture without looking at the op code card. A nice gig from 1980 to 1983. A 20 minute read of K&R C was sufficient to make me productive. C++ followed a couple months later...that's been a moving target since 1983. The 2017 flavor of C++ is very changed vs 1983. I work in Java daily, C/C++ often. Kotlin is the latest language on my list. I play with LISP/Clojure as amusement. Ruby daily, python frequently. JavaScript frequently too. If you're not a polyglot in the computer language world, you won't be employed long. On one project it was necessary to be fluent in Ada, C, C++, FORTRAN, PL/SQL, Java and Javascript. Facility in Windows, Solaris, Linux was a given. DoD clearance and a very special skillset.