enum Class{
    AC,
    BC,
    CC,
    DC
}

struct Student{
    name: String,
    age: i64,
    score: f32,
    class: Class
}

trait Action{
    //接口类
    fn show_age(&self) -> i64 ;
    fn show_class(&self);
}

impl Action for Student{
    fn show_age(&self) -> i64 {
        return self.age;
    }
    fn show_class(&self){
        match self.class{
            Class::AC => println!("Class A"),
            Class::BC => println!("Class B"),
            Class::CC => println!("Class C"),
            Class::DC => println!("Class D"),
            _ => println!("No Class!")
        }
    }
}

impl Student{
    fn show_score(&self) -> f32 {
        return self.score;
    }
    fn prt(&self){
        println!("Name: {0}, Age: {1}, Score: {2}", self.name, self.age, self.score);
    }
}
fn main() {
    let s= Student{
        name : "Van".to_string(), 
        age : 18, 
        score : 99.9,
        class : Class::AC
        };
    println!("{}", s.show_score());
    println!("{}", s.show_age());
    s.prt();
}