Simple Instruction-set for Reactive Automatic Rocket Control

S.I.R.A.R.C.
Simple Instruction-set for Reactive Automatic Rocket Control:
A simple programming language or library used to control rockets mid-flight. Used when human control is too sloppy.
Actively accounts for changing conditions during flight.
Better emulation of real missions (nobody ever really piloted rockets at NASA, it was all computer logic)
It's just cool to mimic SpaceX reusable boosters.
For education: teach people the basics of programming.