Merge pull request #597 from AnthonyMichaelTDM/rust-port-61_Math_Dice

Rust port of 61_Math_Dice

61_Math_Dice/rust/Cargo.toml

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+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand = "0.8.5"

61_Math_Dice/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/) by Anthony Rubick [AnthonyMichaelTDM](https://github.com/AnthonyMichaelTDM)
+
+If you wish to give the user more than 2 attempts to get the number, change value assigned to the num_tries variable at the start of the main function

61_Math_Dice/rust/src/main.rs

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+use rand::{Rng, prelude::{thread_rng}};
+use std::io;
+
+fn main() {
+    //DATA
+    let num_tries:u8 = 2; //number of tries the player gets each round, must be at least 1
+    let mut rng = thread_rng();
+    let mut user_guess: u8;
+    let mut dice_1:u8;
+    let mut dice_2:u8;
+
+    //print welcome message
+    welcome();
+
+    //game loop
+    loop {
+        //roll dice
+        dice_1 = rng.gen_range(1..=6);
+        dice_2 = rng.gen_range(1..=6);
+
+        //print dice
+        print_dice(dice_1);
+        println!("   +");
+        print_dice(dice_2);
+        println!("   =");
+
+        //get user guess, they have 2 tries
+        for t in 0..num_tries {
+            //get guess
+            user_guess = get_number_from_user_input("", "That's not a valid number!", 1, 12);
+
+            //if they get it wrong
+            if user_guess != (dice_1+dice_2) {
+                //print different message depending on what try they're on
+                if t < num_tries-1 { // user has tries left
+                    println!("NO, COUNT THE SPOTS AND GIVE ANOTHER ANSWER.");
+                    println!("   =");
+                } 
+                else { //this is their last try
+                    println!("NO, THE ANSWER IS {}", dice_1+dice_2);
+                }
+            }
+            else {
+                println!("RIGHT!");
+                break;
+            }
+        }
+
+        //play again
+        println!("\nThe dice roll again....");
+    }
+    
+}
+
+/**
+ * prints the welcome message to the console
+ */
+fn welcome() {
+    println!("
+                              MATH DICE
+              CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY
+    \n\n
+    THIS PROGRAM GENERATES SUCCESSIVE PICTURES OF TWO DICE.
+    WHEN TWO DICE AND AN EQUAL SIGN FOLLOWED BY A QUESTION
+    MARK HAVE BEEN PRINTED, TYPE YOUR ANSWER AND THE RETURN KEY.
+    TO CONCLUDE THE LESSON, PRESS Ctrl+C AS YOUR ANSWER.\n
+    ");
+}
+
+/**
+ * print the dice, 
+ */
+fn print_dice(dice_value:u8) {
+    //data
+
+    //top
+    println!(" ----- ");
+    //first layer
+    match dice_value {
+        4|5|6 => println!("| * * |"),
+        2|3 => println!("| *   |"),
+        _=>println!("|     |"),
+    }
+
+    //second layer
+    match dice_value {
+        1|3|5 => println!("|  *  |"),
+        2|4 => println!("|     |"),
+        _=>println!("| * * |"),
+    }
+
+    //third layer
+    match dice_value {
+        4|5|6 => println!("| * * |"),
+        2|3 => println!("|   * |"),
+        _=>println!("|     |"),
+    }
+
+    //bottom
+    println!(" ----- ");
+}
+
+/**
+ * gets a integer from user input
+ */
+fn get_number_from_user_input(prompt: &str, error_message: &str, min:u8, max:u8) -> u8 {
+    //input loop
+    return loop {
+        let mut raw_input = String::new(); // temporary variable for user input that can be parsed later
+
+        //print prompt
+        println!("{}", prompt);
+        //read user input from standard input, and store it to raw_input
+        //raw_input.clear(); //clear input
+        io::stdin().read_line(&mut raw_input).expect( "CANNOT READ INPUT!");
+
+        //from input, try to read a number
+        match raw_input.trim().parse::<u8>() {
+            Ok(i) => {
+                if i < min || i > max { //input out of desired range
+                    println!("{}  ({}-{})", error_message, min,max);
+                    continue; // run the loop again
+                } 
+                else {
+                    break i;// this escapes the loop, returning i 
+                }
+            },
+            Err(e) => {
+                println!("{}  {}", error_message, e.to_string().to_uppercase());
+                continue; // run the loop again
+            }
+        };
+    };
+}