const PI:f64 = 3.141_592_653_59;


fn main() {
  let username:&str = "soetas";
  let mut stars:usize = 789;

  let is_male:bool = false;
  let is_male:&str = "yes";

  static LICENSE:&'static str = "BSD";

  let language = String::from("rust");
  let account:(&str, &str) = ("soetas", "3228891558@qq.com");
  let (username, email) = account;

  let status_code = 500;
  let status_text = match status_code {
      200 => "Ok",
      201 => "Created",
      302 => "Found",
      404 => "Not Found",
      500 => "Internal Server Error",
      _ => "Other"
  };

  let colors = vec!["pink", "orange", "skyblue", ];
  let languages:[&str;3] = ["rust", "go", "python",];

  for i in 0..=10 {
      println!("{}", i);
  }
  
  for color in colors.iter() {
      println!("{}", color);
  }

  loop {
    
  }


  // macro  
  println!("");
  

}