completed rust code for 74 Rock paper scissors

74_Rock_Scissors_Paper/rust/Cargo.toml

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+[package]
+name = "rock_scissors_paper"
+version = "1.0.0"
+edition = "2021"
+
+[dependencies]
+text_io = "0.1.10"
+#num-integer = "0.1"
+rand = "0.8.5"

74_Rock_Scissors_Paper/rust/README.md

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+Original source downloaded [from Vintage Basic](http://www.vintage-basic.net/games.html)
+
+Conversion to [Rust](https://www.rust-lang.org)
+

74_Rock_Scissors_Paper/rust/src/main.rs

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+/*
+ * Rock paper scissors
+ * Port from book _Basic Computer Games_
+ * By David Lotts
+*/
+use rand::Rng;
+use std::io::{self, Write};
+use text_io::{try_read};
+fn main() {
+    let mut computer_wins = 0;
+    let mut human_wins = 0;
+    let mut rng = rand::thread_rng();
+    println!("{:>21}", "GAME OF ROCK, SCISSORS, PAPER");
+    println!("{:>15}", "CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY");
+    print!("\n\n\n");
+    // pass by reference in rust! input() modifies num_games_q.
+    let mut qty_games = 0;
+    loop {
+        input_int("HOW MANY GAMES", &mut qty_games);
+        if qty_games < 11 {
+            break;
+        }
+        println!("SORRY, BUT WE AREN'T ALLOWED TO PLAY THAT MANY.");
+    }
+    for game_number in 1..=qty_games {
+        println!();
+        println!("GAME NUMBER {}", game_number);
+        let my_choice: i32 = rng.gen_range(1..=3); // basic: X=INT(RND(1)*3+1)
+        let mut your_choice = 0;
+        loop {
+            println!("3=ROCK...2=SCISSORS...1=PAPER"); 
+            input_int("1...2...3...WHAT'S YOUR CHOICE", &mut your_choice);
+            // interesting validation in original BASIC: IF (K-1)*(K-2)*(K-3)==0
+            if (1..=3).contains(&your_choice) {
+                break;
+            }
+            println!("INVALID.");
+        }
+        println!("THIS IS MY CHOICE...");
+        println!(
+            "...{}",
+            match my_choice {
+                1 => "PAPER",
+                2 => "SCISSORS",
+                3 => "ROCK",
+                _ => "um, what?",
+            }
+        );
+        if my_choice == your_choice {
+            //THEN 250
+            println!("TIE GAME.  NO WINNER.");
+        } else {
+            //if (my_choice == 1 && your_choice == 3)
+            //    || (my_choice > your_choice)
+            if 1 == (3 + my_choice - your_choice) % 3
+            {
+                println!("WOW!  I WIN!!!");
+                computer_wins = computer_wins + 1;
+            } else {
+                println!("YOU WIN!!!");
+                human_wins = human_wins + 1;
+            }
+        }
+    }
+    println!();
+    println!("HERE IS THE FINAL GAME SCORE:");
+    println!("I HAVE WON {} GAME(S).", computer_wins);
+    println!("YOU HAVE WON {} GAME(S).", human_wins);
+    println!("AND {} GAME(S) ENDED IN A TIE.", qty_games - (computer_wins + human_wins));
+    println!();
+    println!("THANKS FOR PLAYING!!");
+}
+
+fn input_int(prompt: &str, number: &mut i32) {
+    loop {
+        print!("{} ? ", prompt);
+        io::stdout().flush().unwrap();
+        match try_read!() {
+            Ok(n) => {
+                *number = n;
+                return;
+            }
+            Err(_) => println!("{}", prompt),
+        }
+    }
+}
+
+
+// TODO break out the winner decider and test it.
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn winner_test() {
+        assert_eq!(true,true);
+    }
+}