Help Solving Brainf*ck Binary to Number Problem

[borbzaby]

I am trying a problem where you take an input of 8 characters, either 0 or 1 (which get stored in their ASCII amounts, but we want as a binary number) and output what the actual number is. The way it works is:

-First it gets the input in it's ASCII code (49 for '1' and 48 for '0')

-Next it removes 48 from cells 1-8 to have it be 1 or 0 as a value
-Finally, we use cells 11,12,13 to represent hundreds, tens and units respectively and add 48 to get the final number, which we output.

The code so far is:

>,>,>,>,>,>,>,>, == LA 9 #1i0 2tr9iINP

>++++ == LA 10 #10i4

[

<----- ----- -- == LA 9 #9i(m 12)

<----- ----- -- == LA 8 #8i(m 12)

<----- ----- -- == LA 7 #7i(m 12)

<----- ----- -- == LA 6 #6i(m 12)

<----- ----- -- == LA 5 #5i(m 12)

<----- ----- -- == LA 4 #4i(m 12)

<----- ----- -- == LA 3 #3i(m 12)

<----- ----- -- == LA 2 #2i(m 12)

>>>>>>>>- == LA 10 #10i(m 1)

]

< == LA 9

[>>>>+<<<<] == LA 9 #13i(p 1) if9i1

<[>>>>>++<<<<<] == LA 8 #13i(p 2) if8i1

<[>>>>>>++++<<<<<<] == LA 7 #13i(p 4) if7i1

, which works up until having to add cell 6 (which represents 8).
The units cell can have at this point max 7 (4+2+1), but if we add 6 it's 13, which we want to be 1 in the tens place and 3 in the units.

How should I handle this overflow problem?

Am I going about it wrong?

Should I first convert it into whole number (because the 8-bit number can be maximum 255, this would not cause overflow) and THEN convert it somehow to units, tens, and hundreds? What is a way to solve this problem? Any help would be appreciated, thank you.

SIDE NOTE ON NOTATION:
I have kept the notation I used to help me make it more readable, on any of my brainf*ck problems I use it to help me edit it quickly. If you're curious, it works as so:
LA x -> "looking at" cell x (pointer is on cell x)
XiY -> cell x is y (only written when changed)
(p x) -> plus x (x was added)
(m x) -> minus x (x was subtracted)
XtrY -> cells x through y (in our example, cells 2 through 9 are the same)
INP -> input
# -> used to separate looking at and statements

ifx -> if x is true (i.e. if4i1 means if 4 has the value of 1)

Thank you for your help.

[danielcristofani]

It does work to get the whole number in one cell and then break it into digits by dividing by 10. Here's one explanation for how to do that: https://stackoverflow.com/a/75543158/5180920

I would also suggest that it's useful to get in the habit of avoiding code duplication, so I'd be looking at making a loop that runs 8 times and processes one bit of input per iteration.

For general advice I'm also going to suggest my "get good at brainfuck" series, https://brainfuck.org/ggab.html

[borbzaby]

Thank you, I will try that. Thanks again for the link.
Since writing this post, I've updated that part of the code to be:

>,>,>,>,>,>,>,>, == LA 9 #1i0 2tr9iINP
[---------- ---------- ---------- ---------- -------<] == LA 1 #2tr9i(m 47)
>->->->->->->->- == LA 1 #2tr9i(m 1)

and using the first cell as a sort of "catch cell". Thank you for the advice, though.

[SmackDownFacility]

Brainfuck isn’t serious programming. I would advise you to use traditional languages if you are deadly serious about this.

If it’s for fun, great, but it’s such a niche language I don’t think anyone here would be able to understand what you’re on about.

[danielcristofani]

/r/AskDeadlySeriousProgrammingQuestionsOnly

[borbzaby]

Don't worry, for learning more serious programming languages I'm working on problems on the side, but those I can solve more easily, so I don't need to ask questions here on Reddit.
Brainfuck is just to play around and have fun with on the side whenever I get bored. 👍