small_exercise250611_rust_practice

练习

cargo init

cargo run

代码如下

fn main() {
    // test_if();

    // test_while();

    // test_loop();

    test_for();
}

#[allow(dead_code)]
fn test_if() {
    let age_to_drive = 16u8;

    println!("Enter the persion's age:");

    let myinput = &mut String::from("");
    std::io::stdin().read_line(myinput).unwrap();

    // "15\r\n"
    println!("{:?}", myinput);

    let age = myinput.replace("\r\n", "").parse::<u8>().unwrap();

    if age > age_to_drive {
        println!("old enough");
    } else if age == age_to_drive {
        println!("with one more year .");
    } else {
        println!("wait a bit longer, u an't old enough for a driver's license!!");
    }

    let drivers_license = if age >= 16 { true } else { false };
}

#[allow(dead_code)]
fn test_while() {
    let age_to_drive = 16u8;

    let mut current_age = 0u8;

    while current_age < age_to_drive {
        println!("while true waiting......");
        current_age += 1;

        if current_age == 6 {
            break;
        }
    }
}

#[allow(dead_code)]
fn test_loop() {
    let mut x = 1;
    loop {
        println!("Hello rust");
        if x > 5 {
            break;
        }
        x += 1;
    }
}

fn test_for() {
    let ages = [14, 18, 26, 35, 41];

    let age_to_drive = 16i32;

    for age in ages {
        if age >= age_to_drive {
            println!("great, u can drive a car now....{0}", age);
        } else {
            println!("u need wait a little bit more.. {0}", age);
        }
    }

}