17 replies to this topic

[shugotenshi]

i'm new here, and new to programming on calculators, so i need some help.
the more i try the more i mess up this hellava simple program... decomposing a number into prime factors.

this is my code as is (if you see any bugs please tell me what to correct ):

ClrText
"INSERT NUMBER" ?->A
Do
While Frac (A/B)=0
B
A/B->A
WhileEnd
If B=2
Then 3->B
Else B+2->B
IfEnd
LpWhile B<A
"END"

thanks!

[Overlord]

You should add a 2->B at the beginning

[Bija]

i tested it and it works fine except 2 things :
you should put 2->B at the beginning of the program
you should do LpWhile B<=A (<= means the symbol for inferior or equal) instead of LpWhile B<A because if B=A, B is a factor of A

then it works fine!
good continuation !

[Overlord]

you should do B<=sqrt(A), and display A at the end if A != 1 because if X is a prime factor of A, X can't be > sqrt(A) except if A is prime

[shugotenshi]

thanks guys!
you were a great help

[shugotenshi]

Sorry about double posting, but i didnt want to start a new thread.
You guys really helped me out back there! thanks a bunch!
Im having trouble passing this same program to the Casio CFX-9850 GB Plus.
I can't transfer it by cable, but i have rebuilt it almost intirely on that calculator using the same code. All that's missing is how the "Frac" command.
And i can't find it for the life of me XD
Does anyone know if that model has the "Frac" command at all? If so how do i find it? Will the program run once i've input it?

[huhn_m]

it has. It is somewhere udner OPT->NUM

You can'T transfer from FX 1.0+ to CFX since they have different protocolls. However there is a possibility to transfer from CFX to FX 1.0

[Overlord]

if you really don't have Frac you can use
Frac X = X - Int X

[Bija]

and if he hasn't Int ?
because Int et Frac are in the same menu ...

[Overlord]

11->B
While B>=0
While X>=10^B
X-10^B=>X
WhileEnd
B-1=>B
WhileEnd
X
:p:p ?

[octobclrnts]

No, No. Frac and Int are definately both there (I just checked to make sure). They are under OPTN->NUM just as huh_m said.

[DarkDead]

Hi. A friend of mine said he once could decompose a number in the RUN.MAT menu (menu 1) on a 9860. I've searched the manual and I only found a program to do this. Is that possible and does anyone know how to do it?

[kucalc]

Try looking here: http://www.brianhetr...io/ikeyseq.html

[Scott]

Hey all, I had a guy make me a program that could work out whether a number is a prime or not. Its usefull but really slow when it comes to larger numbers. If someone could tell me a different format on how tomake this quicker that would be usefull.

[codebox]"Number"?->A
2->B
While Frac (A/B)\=0
B+1=B
If B=A
Then "prime"
Stop
Ifend
WhileEnd
"Not prime"[/codebox]
This is very simalar but slightly different so all i want to know is how to make it faster.
Cheers

[2072]

I've made such a program a long time ago, it's a lot more optimized than this one, it's in the filsharing: http://www.casiocalc...s#prime_numbers

[Scott]

I've made such a program a long time ago, it's a lot more optimized than this one, it's in the filsharing: http://www.casiocalc...s#prime_numbers

Thanks I checked it out but as I dont have a cable I really dont want to type it out by hand. How can you start a new topic, Im stuck?

[Scott]

Ha I found out how to post a topic, ive got a question up there i would want answered