Learning to write .bin files.

[onyx topaz]

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[late fossil]

what isn't working about your implementation for 4?

what do you mean by 'removing bytes'?

'removing bytes' from an array doesn't really make sense in the C world

an array is a chunk of bytes with a fixed size

but what do you mean by 'remove anything', as in make all of the bytes 0?

That isn't possible, an array has a fixed size once it's created

[dense jackal]

Maybe I should try a different approach.

[late fossil]

Not really, because you don't know the sizes at compile time you're creating VLAs

Which are somewhat of a sin in C

I would recommend using dynamic memory allocation (e.g. malloc)

[dense jackal]

+ 1. Creates x random bytes and assign it to a variable {somehow}...
+ 2. Save the contents (of the variable) to a .bin file.
+ 3. Read the contents of a .bin file and store it to a variable {somehow}...
+ 4. Copy the last x bytes of the {somehow created} variable and assign it to another variable. Delete the copied bytes from the {somehow created} variable...

@late fossil how would you do this?

*random bytes

[late fossil]

Malloc, realloc, etc.

Just move from arrays to dynamically allocated stuff

[dense jackal]

I see. I used arrays because I recently learned about them, however malloc is new to me.

[late fossil]

Its a learning curve, but worth it :(

:)*

[dense jackal]

I can already sense the memory leaks.

What are VLAs?

@late fossil

Ah, I think I can also just move the file pointer:

fseek(file, -number_of_bytes_to_read, SEEK_END);

[late fossil]

VLAs are variable length arrays

arrays get allocated on the stack, and usually the compiler knows the size of everything on the stack at compile time

but it doesn't know that about VLAs, which means that they're really slow to use

[dense jackal]

Ah good to know 🙂 Thanks

[onyx topaz]

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@dense jackal

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[dense jackal]

!solved