카타 8급 Grasshopper - Grade book

Rust

fn get_grade(s1: u16, s2: u16, s3: u16) -> char {
    match (s1 + s2 + s3) / 3 {
        90.. => 'A',
        80.. => 'B',
        70.. => 'C',
        60.. => 'D',
        _ => 'F'
    }
}