fn main() {

  let day = 4;

​

  let result = match day {

    1 => "Monday",

    2 => "Tuesday",

    3 => "Wednesday",

    4 => "Thursday",

    5 => "Friday",

    6 => "Saturday",

    7 => "Sunday",

    _ => "Invalid day.",

  };

​

  println!("{}", result);

}