Rust中的控制结构

fn main() {
    let number = ;
     {
    println!("condition was true");
    } else {
    println!("condition was false");
    }
     ==  {
    println!("number is divisible by 4");
    }  ==  {
    println!("number is divisible by 3");
    } else {
    println!("number is not divisible.");
    }
    let condition = true;
    let number = if condition {

    } else {

    };
    println!("the value of number is: {}", number);

    let mut counter = ;

    let result = loop {
    counter += ;
     {
        ;
    }
    };
    println!("the value of result is: {}", result);

    let mut number = ;
     {
    println!("{}!", number);
    number = number - ;
    }

    let a = [, , , , ];
    for element in a.iter() {
    println!("the value is: {}", element);
    }

    ..).rev() {
    println!("{}!", number);
    }
}