HP50g small tips and trick

[grsbanks]

(06-16-2018 09:26 PM)DavidM Wrote:  

Code:

"D9D20DF55079E600F8E36C250F9F60B2130" H→ EVAL

To work properly, this code cannot reside within a subroutine or structural statement (IF-THEN, FOR, DO, WHILE, CASE, etc. -- anything that requires an END, NEXT/STEP, or embedded »). The typical use of this sequence is to simply place it as the last steps before the final "»" of the program object.

Simple but effective.

For those interested, the SysRPL listing of this is:

Code:

::
  NULL::
  ' xORDER
  >HCOMP
  >R
;

"NULL::" creates an empty program on the stack (":: ;", a bit like the UserRPL "<< >>")

"' xORDER" places the ID of the UserRPL command "ORDER" on the stack, then:

">HCOMP" adds it to the empty program. leaving us with ":: xORDER ;" on the bottom of the stack.

">R" pushes that to the run stream so that ":: xORDER ;" is run immediately after the SysRPL program has finished and before returning control to the user.

Ingenious