rust 01

// main.rs
// https://rinthel.github.io/rust-lang-book-ko/ch03-05-control-flow.html

fn main() {
    // Q1 섭씨 화씨 계산
    let far = cel2far(32);
    let cel = far2cel(far);

    println!("far: {}, cel: {}", far, cel);

    // Q2 n 피보나치
    for i in 0..11 {
        let f = fibo(i);
        println!("fibo[{}] : {}", i, f);
    }
}

fn cel2far(cel: i32) -> i32 {
    cel * 9 / 5 + 32
}

fn far2cel(far: i32) -> i32 {
    (far - 32) * 5 / 9
}

fn fibo(n: i32) -> i32 {
    if n < 2 { return n; } else { fibo(n - 2) + fibo(n - 1) }
}

// 👏
fn fibonacci_recursive(n: i32) -> u64 {
    if n < 0 {
        panic!("{} is negative!", n);
    }
    match n {
        0     => panic!("zero is not a right argument to fibonacci_recursive()!"),
        1 | 2 => 1,
        3     => 2,
        _     => fibonacci_recursive(n - 1) + fibonacci_recursive(n - 2)
    }
}

오랜만에 시간이 남아 다른 언어를 접해봤는데 재미가 있다.