Reddit Daily Programmer - Challenge #361 [Easy] Tally Program

tally_score.rs

//A program for the r/dailyprogrammer challenge #361 [Easy] Tally Program, done using Rust.
use std::io;

#[derive(Debug)]
struct ScoreCard {
    a: i32,
    b: i32,
    c: i32,
    d: i32,
    e: i32,
}

fn main() {
	let input = get_input();
    let mut scores = ScoreCard {a: 0, b: 0, c: 0, d: 0, e: 0};
    for letter in input.chars() {
        match letter {
            'a' => scores.a += 1,
            'b' => scores.b += 1,
            'c' => scores.c += 1,
            'd' => scores.d += 1,
            'e' => scores.e += 1,
            'A' => scores.a -= 1,
            'B' => scores.b -= 1,
            'C' => scores.c -= 1,
            'D' => scores.d -= 1,
            'E' => scores.e -= 1,
            _ => println!("Error: Use only letters a, b, c, d, or e."),
        }
    }
    show_result(&scores);
}

fn get_input() -> String {
    //Get user input
    let mut input = String::new();
    io::stdin().read_line(&mut input)
        .expect("Failed to read line");
    input.trim().to_string()
}

fn show_result(scores: &ScoreCard) {
    //Show the result
    let mut ordered_scores = vec!(scores.a, scores.b, scores.c, scores.d, scores.e);
    ordered_scores.sort();
    println!("{:?}", ordered_scores);
    //TODO: order the players as well.
    for (person, score) in ordered_scores.iter().rev().enumerate() {
        match person {
            4 => println!("e: {}", score),
            _ => print!("{}: {}, ", ['a', 'b', 'c', 'd', 'e'][person], score),
        }
    }
}