68 lines
2.1 KiB
Rust
68 lines
2.1 KiB
Rust
// Use a custom type to identify the different shapes that can be used in the game.
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#[derive(Copy, Clone)]
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enum Shape {
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Rock,
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Paper,
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Scissors,
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}
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// Allows us to use the shapes without the Shape:: prefix.
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use Shape::*;
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fn main() {
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// Use command line arguments to specify the input filename.
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let args: Vec<String> = std::env::args().collect();
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if args.len() < 2 {
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panic!("Usage: ./main <input-file>\nNo input file provided. Exiting.");
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}
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// Next, read the contents of the input file into a string for easier processing.
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let input = std::fs::read_to_string(&args[1]).expect("Error opening file");
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// Line-by-line processing is easiest.
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let mut input = input.lines();
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// --- TASK BEGIN ---
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let mut total_score = 0;
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while let Some(line) = input.next() {
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// Translate the line's first character into its respective shape.
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let opponent_shape = match line.chars().nth(0) {
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Some('A') => Rock,
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Some('B') => Paper,
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Some('C') => Scissors,
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_ => { panic!("Unexpected left character."); }
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};
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// Translate the line's second character into its respective shape.
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let player_shape = match line.chars().nth(2) {
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Some('X') => Rock,
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Some('Y') => Paper,
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Some('Z') => Scissors,
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_ => { panic!("Unexpected right character."); }
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};
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// Add the score for the matchup (win/loss/draw) to the total score.
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total_score += match (player_shape, opponent_shape) {
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(Rock , Rock ) => 3,
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(Rock , Paper ) => 0,
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(Rock , Scissors) => 6,
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(Paper , Rock ) => 6,
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(Paper , Paper ) => 3,
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(Paper , Scissors) => 0,
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(Scissors, Rock ) => 0,
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(Scissors, Paper ) => 6,
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(Scissors, Scissors) => 3,
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};
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// Add the score of the player's shape to the total score.
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total_score += match player_shape {
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Rock => 1,
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Paper => 2,
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Scissors => 3,
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};
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}
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println!("Total score: {}", total_score);
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}
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