Most mind-blowing program for your favorite calculator

[Thomas Klemm]

(06-30-2022 07:34 AM)Csaba Tizedes Wrote:  2.) GCD (8 steps) for HP15C without MOD: GCD (Greatest Common Divisor) for HP-15C (8 steps) without MOD

These programs to calculate the GCD use only 5 steps:

HP-11C

Code:

001 -    42 20  x>y       
002 -       34  x<>y      
003 -       30  -         
004 -    43 36  LSTx      
005 -    42 40  x=y

HP-15C

Code:

001 - 43,30, 7  TEST 7      
002 -       34  x<>y        
003 -       30  -           
004 -    43 36  LSTx        
005 - 43,30, 5  TEST 5

Example

CLEAR PRGM

112
ENTER
63
R/S

7.0000

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Remark: These steps must be the only ones in memory.
Otherwise the program will not jump to the first line if the condition in line 005 is false.