HP Prime Graphing Calculator - Manual (Page 578)

574 Programming
In a program, store the constant number (or its name) into
the variable AFormat.
0 System
1 Standard
2 Fixed
3 Scientific
4 Engineering
Example:
Scientific  A Format
or
3  A Format
Results
variables
The Function, Linear Solver, Statistics 1Var, Statistics 2Var,
and Inference apps offer functions that generate results
that can be re-used outside those apps (such as in a
program). For example, the Function app can find a root
of a function, and that root is written to a variable called
Root. That variable can then be used elsewhere.
The results variables are listed with the apps that generate
them. See “App variables” on page 432.