【Rust】入門してみました③

Rust の勉強をしてみたのでここにメモを残します。

if

コード

fn divisible(number: i32) {
    if number % 4 == 0 {
        println!("number({}) is divisible by 4", number);
    } else if number % 2 == 0 {
        println!("number({}) is divisible by 2", number);
    } else {
        println!("number({}) is not divisible by 4 or 2", number);
    }
}

fn main() {
    divisible(1);
    divisible(2);
    divisible(3);
    divisible(4);
    divisible(5);
    divisible(6);
    divisible(7);
    divisible(8);
    divisible(9);
}

実行

$ ./sample
number(1) is not divisible by 4 or 2
number(2) is divisible by 2
number(3) is not divisible by 4 or 2
number(4) is divisible by 4
number(5) is not divisible by 4 or 2
number(6) is divisible by 2
number(7) is not divisible by 4 or 2
number(8) is divisible by 4
number(9) is not divisible by 4 or 2

loop

コード

fn main() {
    let mut counter = 0;
    let result = loop {
        counter += 1;
        if counter == 10 {
            break counter * 2;
        }
    };
    
    println!("The result is {}", result);
}

実行

$ ./sample
The result is 20

while

コード

fn main() {
    let mut number = 3;
    while number != 0 {
        println!("{}", number);
        number -= 1;
    };
    
    println!("LIFTOFF!!!");
}

実行

$ ./sample
3
2
1
LIFTOFF!!!

for

コード

fn main() {
    let a = [10, 20, 30, 40, 50];
    
    for element in a.iter() {
        println!("the value is: {}", element);
    }
}

実行

$ ./sample
the value is: 10
the value is: 20
the value is: 30
the value is: 40
the value is: 50