99 Bottles of Beer in Rust

main.rs

fn main() {
    bottlesong_rec(99);
    bottlesong_loop(99);
}

fn bottlesong_rec(bottle_number: i32) {
    if bottle_number > 0 {
        println!("{0} bottle{1} of beer on the wall, {0} bottle{1} of beer.", bottle_number, compute_plural(bottle_number));
        if bottle_number == 1 {
            println!("Take one down and pass it around, no more bottles of beer on the wall.\n\n\
            No more bottles of beer on the wall, no more bottles of beer.\n\
            Go to the store and buy some more, 99 bottles of beer on the wall.");
        } else {
            println!("Take one down and pass it around, {} bottle{} of beer on the wall.\n", bottle_number - 1, compute_plural(bottle_number-1));
            bottlesong_rec(bottle_number - 1);
        }
    }
}

fn bottlesong_loop(start_bottle_number: i32) {
    for bottle_number in start_bottle_number..1 {
        if bottle_number == 1 {
            println!("Take one down and pass it around, no more bottles of beer on the wall.\n\n\
            No more bottles of beer on the wall, no more bottles of beer.\n\
            Go to the store and buy some more, 99 bottles of beer on the wall.");
        } else {
            println!("Take one down and pass it around, {} bottle{} of beer on the wall.\n", bottle_number - 1, compute_plural(bottle_number-1));
        }
    }
}

fn compute_plural(count: i32) -> String {(if count == 1 {""} else {"s"}).to_string()}