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Cake day: August 7th, 2023

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  • Not really. Using % of forecast area as % chance of rain inherently gives equal weight to your position being anywhere within that area. Even if you limit the forecast area to the 5m or whatever it is radius that smartphone GPS is typically accurate to which a weather app could theoretically do, simply using % of the forecast area covered as % chance of rain inherently gives equal probability of you being literally anywhere within that 5m radius. It would obviously still be more accurate, but those numbers wouldn’t be the same thing.









  • #include <stdio.h>
    
    int main() {
    
    Long long x = 0x7165498511230;
    
    while (x) putchar(32 + ((0xC894A7875116601 >> ((x >>= 4) & 15) * 7) & 0x7F));
    
    return 0;
    }
    

    Might be wrong on a few things here as I haven’t done C++ in a while, but my understanding is this. I’m sure you can guess that this is just a very cheekily written while loop to print the characters of “Hello, World!” but how does it work? So first off, all ASCII characters have an integer value. That 32 there is the value for the space character. So depending on what ((0xC894A7875116601 >> ((x >>= 4) & 15) * 7) & 0x7F)) evaluates down into you’ll get different characters. The value for “H” for example is 72 so that first iteration we know that term somehow evaluated to the number 40 as 72 - 32 = 40.

    So how do we get there? That big number, 0xC894A7875116601 is getting shifted right some number of bits. Let’s start evaluating the parenthesis. (X >>= 4) means set x to be itself after bit shifting it right by 4 bits then whatever that number is we bitwise AND it with 15 or 1111 in binary. This essentially just means each iteration we discard the rightmost digit of 0x7165498511230, then pull out the new right most digit. So the first iteration the ((x >>= 4) & 15) term will evaluate to 3, then 2, then 1, then 1, etc until we run out of digits and the loop ends since effectively we’re just looking for x to be 0.

    Next we take that number and multiply it by 7. Simple enough, now for that first iteration we have 21. So we shift that 0xC894A7875116601 right 21 bits, then bitwise AND that against 0x7F or 0111 1111 in binary. Just like the last time this means we’re just pulling out the last 7 bits of whatever that ends up being. Meaning our final value for that expression is gonna be some number between 0 and 127 that is finally added to 32 to tell us our character to print.

    There are only 10 unique characters in “Hello, World!” So they just assigned each one a digit 0-9, making 0x7165498511230 essentially “0xdlroW ,olleH!” The first assignment happens before the first read, and the loop has a final iteration with x = 0 before it terminates. Which is how the “!” gets from one end to the other. So they took the decimal values for all those ASCII characters, subtracted 32 then smushed them all together in 7 bit chunks to make 0xC894A7875116601 the space is kinda hidden in the encoding since it was assigned 9 putting it right at the end which with the expression being 32 + stuff makes it 0 and there’s an infinitely assumed parade of 0s to the left of the C.






  • For me it’s even weirder than that. Those pictures exist in my mind and I can “feel” them there but the conscious part of me that’s supposed to see them can’t see shit. I can describe to you the things that are in them or even draw them out as they exist in my mind, but I can’t see them. The part of me that’s giving directions? It can “see” the map of the building and my position in it just fine like it’s staring straight at a live minimap, but the conscious part of me that should be able to visualize that stuff? Nothing. I close my eyes and try to visualize that dog and I see nothing but black. But I can feel the presence of the image that the part of me that does the mental conjuring of images is making.

    It’s like turning the monitor off on a computer. Everything is still running even though you can’t see it.



  • It’s hard to describe for me. Cuz I don’t actually “see” anything I try to imagine. If I close my eyes and try to visualize say an image of a desk at a window all I see is darkness. The image exists, I can I guess I’d say “feel” it there and i could even draw it. But I can’t “see” it. Like the part of me that’s making the picture is drawing it on a live stream but the part of me that should be seeing the stream has the monitor off.

    Same with the whole internal monologue thing. I don’t “hear” the words in my head or “see” them written out in my imagination but I kinda just “feel” them there. It poses a problem when my mind really gets going because there will be often like half a dozen different distinct thoughts I can feel in there. So I end up having to talk to myself out loud in order to keep from losing whatever thread I’m trying to follow.