Casio fx-9750GIII vs. HP35s - Professional Use

[bxparks]

Is the fx-9750giii programmable in C, so that I can write an RPN app for it? :-) I know nothing about the Casio ecosystem. I do like its size and shape, and the standard AAA batteries, which means standard NiMH rechargeables.

The used prices for the HP-35s and HP-50g are indeed insane. I regret not buying them when they were in production. But I didn't know about them until recently, having been out of the calculator world for a couple of decades.