Rust code shared from the playground

playground.rs

#![allow(unused_variables)]

fn show_line(array: [bool; 80]) {
    
    for i in 0..80 {
        if array[i] {
            print!("+");
        } else {
            print!(" ");
        }
    }
    println!();
}


fn find_changes(array: [bool; 80]) -> [bool; 80] {
    let mut arr: [bool; 80] = [false; 80]; // Initialize an array holding 100 false values.

    // 110 = 1
    // 101 = 1

    // 111 = 0
    // 100 = 0

    // 011 = 1
    // 010 = 1
    // 001 = 1
    
    // 000 = 0
    
    for i in 0..78 {
        if array[i] {
            arr[i+1] = (array[i+1] && !array[i+2]) || (!array[i+1] && array[i+2]); // true if 110 or 101
        } else {
            arr[i+1] = (array[i+1] && array[i+2]) || (array[i+1] && !array[i+2]) || (!array[i+1] && array[i+2]); // true if 011 or 010 or 001
        }
    }

    // corner case 1
    if array[78] {
        arr[79] = (array[79] && !array[0]) || (!array[79] && array[0]); // true if 110 or 101
    } else if !array[78] {
        arr[79] = (array[79] && array[0]) || (array[79] && !array[0]) || (!array[79] && array[0]); // true if 011 or 010 or 001 
    }

    // corner case 2
    if array[79] {
        arr[0] = (array[0] && !array[1]) || (!array[0] && array[1]); // true if 110 or 101 
    } else if !array[79] {
        arr[0] = (array[0] && array[1]) || (array[0] && !array[1]) || (!array[0] && array[1]); // true if 011 or 010 or 001
    }

    arr 
}

fn main() {
    let mut array: [bool; 80] = [false; 80];
    // array[77] = true;
    // array[78] = true;
    array[79] = true;
    
    println!("Rule 110:");

    for _ in 0..80 {
        show_line(array);
        array = find_changes(array);
    }
}