Rust bitwise operations example

rust-bitwise-example.rs

// Following: https://dev.to/somedood/bitmasks-a-very-esoteric-and-impractical-way-of-managing-booleans-1hlf

fn repr(label: &str, num: i8) {
    /* Convenience function that prints `num`, which must be an i8,
    as its 8-bit representation, and as an integer.

    We use `{:#010b}` because when printing with `{:#}`, the number
    of padded values on the left includes the initial `0b`.

    E.g. `repr("Anything", 1)` prints this output:

    ```text
    Any label:  	0b00000001, Number: 1
    ```

    */
    println!("{label}:  \t{:#010b}, Number: {}", num, num);
}

fn main() {
    let num1: i8 = 0b1010; // 10
    let num2: i8 = 0b1111; // 15

    println!("num1: {:?}", num1);
    println!("num2: {:?}", num2);

    println!("====== std::ops::Not");
    repr("!num1", !num1);
    repr("!num2", !num2);

    println!("====== num1 & num2");
    {
        let res = num1 & num2;

        repr("Result", res);
    }

    println!("====== num1 | num2");
    {
        let res = num1 | num2;

        repr("Result", res);
    }

    println!("====== num1 ^ num2");
    {
        let res = num1 ^ num2;

        repr("Result", res);
    }

    println!("====== num1 bitshift left by 1");
    {
        let res = num1 << 1;

        repr("Original", num1);
        repr("Result", res);
    }

    println!("====== num1 bitshift left by 2");
    {
        let res = num1 << 2;

        repr("Original", num1);
        repr("Result", res);
    }

    println!("====== num1 bitshift right by 1");
    {
        let res = num1 >> 1;

        repr("Original", num1);
        repr("Result", res);
    }

    println!("====== num1 bitshift right by 2");
    {
        let res = num1 >> 2;

        repr("Original", num1);
        repr("Result", res);
    }

    println!("====== num1 bitshift right by 4");
    {
        let res = num1 >> 4;

        repr("Original", num1);
        repr("Result", res);
    }

    println!("====== num2 bitshift left by 1");
    {
        let res = num2 << 1;

        repr("Original", num2);
        repr("Result", res);
    }

    println!("====== num2 bitshift left by 2");
    {
        let res = num2 << 2;

        repr("Original", num2);
        repr("Result", res);
    }

    println!("====== num2 bitshift right by 1");
    {
        let res = num2 >> 1;

        repr("Original", num2);
        repr("Result", res);
    }

    println!("====== num2 bitshift right by 2");
    {
        let res = num2 >> 2;

        repr("Original", num2);
        repr("Result", res);
    }

    println!("====== num2 bitshift right by 4");
    {
        let res = num2 >> 4;

        repr("Original", num2);
        repr("Result", res);
    }
}