Cam Cam - 1 year ago 100
Brainfuck Question

How to get a large integer as input and store it in memory

I know that performing arithmetic on large integers in brainfuck, while perhaps quite tedious at times, is entirely possible.

However what I'm wondering about is what the generally acceptd best-practices are for taking in large integers (or even strings, I suppose) as input.

Most compilers/interpreters allow you to provide full strings at once as input (and then each character is read in individually with a

). But what I'm wondering is this - how can you read one in if you don't know when the input stream is going to stop? I suppose one way is to tell the user to append a certain character/string of characters to their number to indicate that it's over, but that seems a bit non-user-friendly.

I'd prefer an answer that keeps portability in mind (implementation-specific solutions are of interest, but are not the primary focus of this question). If there is no completely implementation-agnostic way to do this, one that will work on most implementations and fail gracefully otherwise would be the next best thing.

Thanks in advance.

Mau Mau
Answer Source

Most languages let you read a line from input (e.g. gets() in C, ReadLine() in C# etc). Why not ask the user to enter each value as a line (i.e. separated by enter)?

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