Most mind-blowing program for your favorite calculator

[Thomas Klemm]

(07-01-2022 05:38 AM)pauln Wrote:  The non-mod version of Euclid's algorithm …

This mod version program for the HP-15C uses one register but only 8 steps:

Code:

001 -    44  0  STO 0       
002 -       34  x<>y        
003 -       36  ENTER       
004 - 45,10, 0  RCL/ 0      
005 -    43 44  INT         
006 - 45,20, 0  RCLx 0      
007 -       30  -           
008 -    43 20  x=0

Example

CLEAR PRGM

112
ENTER
63
R/S
R↓

7.0000


You are free to add LBL, GTO, R↓ and RTN if you feel like this is cheating.