(15C) Prime Factorization
03-23-2017, 03:08 AM
Post: #1
 Eddie W. Shore Senior Member Posts: 1,039 Joined: Dec 2013
(15C) Prime Factorization
This program does exactly this: factors an integer. Fix 0 mode is activated during execution. Each factor is displayed by pressing [R/S]. The calculator is returned to Fix 4 mode when the program is completed. If the integer is a prime number, the program just returns the integer entered.

Code:
 Step    Key    Code 001    LBL B    42, 21, 22 002    FIX 0    42, 7, 0 003    STO 2    44, 2 004    STO 0    44, 0 005    2    2 006    STO 1    44, 1 007    LBL 3    42, 21, 3 008    RCL 0    45, 0 009    RCL÷ 1    45, 10, 1 010    ENTER    36 011    FRAC    42, 44 012    X=0    43, 20 013    GTO 2    22, 2 014    1    1 015    STO+ 1    44, 40, 1 016    GTO 3    22, 3 017    LBL 2    42, 21, 2 018    RCL 1    45, 1 019    R/S    31 020    R↓     33 021    R↓    33 022    STO 0    44, 0 023    1    1 024    -    30 025    X≠0    43, 30, 0  (TEST 0) 026    GTO 3    22, 3 027    LBL 2    45, 2 028    FIX 4    42, 7, 4   029    RTN    43, 32
Example: 150. Factors: 2, 3, 5, 5 (when the display reads 150.0000 the factorization ends)
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