Bitwise And Not Like the Other

Oct 6, 2019

bits

one of these is not like the other

in which the hero of this website discovers one mustn’t judge a bitwise op by its cover.

C

get a load of this:

bit.c

#include <stdio.h>

int main(int argc, const char *argv[])
{
    
    int a = 2147483648; 
    int b = 7;

    printf("%d\n", a & b);

    return a & b;
}

run it

[jared blog]  (master)
$ gcc -o bit bit.c
[jared blog]  (master)
$ ./bit
0

straight forward enough. Nothing suprising here.

python

bit.py

def bit() -> int:
    a = 2147483648
    b = 7

    print(f'{a & b}')

    return 0


if __name__ == '__main__':
    bit()

run it

[jared blog]  (master)
$ python bit.py
0

same here. just some everyday run-of-the-mill stuff.

rust

src/main.rs

fn main() {
    let a: i32 = 2147483647;
    let b: i32 = 7;

    println!("{}", a & b);
}

run it

[jared blog]  (master)
$ cargo run
    Finished dev [unoptimized + debuginfo] target(s) in 0.01s
     Running `target/debug/blog`
7

O__o wut?

I don’t actually get what’s going on here yet.

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