Rust Translation for Dice

33_Dice/rust/src/main.rs

@@ -0,0 +1,85 @@
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// Dice
+//
+// From: BASIC Computer Games (1978)
+//       Edited by David H. Ahl
+//
+// "Not exactly a game, this program simulates rolling
+//  a pair of dice a large number of times and prints out
+//  the frequency distribution.  You simply input the
+//  number of rolls.  It is interesting to see how many
+//  rolls are necessary to approach the theoretical
+//  distribution:
+//
+//  2  1/36  2.7777...%
+//  3  2/36  5.5555...%
+//  4  3/36  8.3333...%
+//    etc.
+//
+// "Daniel Freidus wrote this program while in the
+//  seventh grade at Harrison Jr-Sr High School,
+//  Harrison, New York."
+//
+// Rust Port by Jay, 2022
+//
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+use rand::Rng;
+use std::io::{self, Write};
+
+fn main() {
+    let mut frequency: [i32; 13] = [0; 13];
+    println!(
+        "{: >38}\n{: >57}\n\n",
+        "DICE", "CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY"
+    );
+    // DANNY FREIDUS
+    println!("THIS PROGRAM SIMULATES THE ROLLING OF A");
+    println!("PAIR OF DICE.");
+    println!("YOU ENTER THE NUMBER OF TIMES YOU WANT THE COMPUTER TO");
+    println!("'ROLL' THE DICE.  WATCH OUT, VERY LARGE NUMBERS TAKE");
+    println!("A LONG TIME.  IN PARTICULAR, NUMBERS OVER 5000.");
+    let mut playing = true;
+    while playing {
+        let n = match readinput(&"HOW MANY ROLLS").trim().parse::<i32>() {
+            Ok(num) => num,
+            Err(_) => {
+                println!("PLEASE ENTER A NUMBER");
+                continue;
+            }
+        };
+        // Dice Rolled n times
+        for _i in 0..n {
+            let die_1 = rand::thread_rng().gen_range(1..=6);
+            let die_2 = rand::thread_rng().gen_range(1..=6);
+            let total = die_1 + die_2;
+            frequency[total] += 1;
+        }
+
+        // Results tabel
+        println!("\nTOTAL SPOTS    NUMBER OF TIMES");
+        for i in 2..13 {
+            println!("{:^4}\t\t{}", i, frequency[i]);
+        }
+
+        // Continue the game
+        let reply = readinput("TRY AGAIN").to_ascii_uppercase();
+        if reply.starts_with("Y") || reply.eq("YES") {
+            frequency = [0; 13];
+        } else {
+            playing = false;
+        }
+    }
+}
+
+// function for getting input on same line
+fn readinput(str: &str) -> String {
+    print!("\n{}? ", str);
+    let mut input = String::new();
+    io::stdout().flush().unwrap();
+    io::stdin()
+        .read_line(&mut input)
+        .expect("Failed to get Input");
+    input
+}