finish rust port of 22_Change

22_Change/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]

22_Change/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)

22_Change/rust/src/main.rs

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+use std::io::{self, stdout, Write};
+
+fn main() {
+    //DATA
+    let mut cost_in_cents:i16;
+    let mut payment_in_cents:i16;
+    let mut amount_owed_in_cents:i16;
+
+    let mut hundred:i16;
+    let mut fifty:i16;
+    let mut twenty:i16;
+    let mut ten:i16;
+    let mut five:i16;
+    let mut one:i16;
+    let mut quarters:i16;
+    let mut dimes:i16;
+    let mut nickles:i16;
+    let mut pennies:i16;
+
+    //print welcome message
+    welcome();
+
+    //print prompt
+    println!("I, YOUR FRIENDLY MICROCOMPUTER, WILL DETERMINE");
+    println!("THE CORRECT CHANGE FOR ITEMS COSTING UP TO ${}.00.",i16::MAX/100);
+
+    //game loop 
+    loop {
+        //get cost of items
+        cost_in_cents = get_dollar_value_in_cents_from_user("COST OF ITEM:\t\t$");
+        //get amount they already paid
+        payment_in_cents = get_dollar_value_in_cents_from_user("AMOUNT OF PAYMENT:\t$");
+
+        //calculate amount they owe
+        amount_owed_in_cents = payment_in_cents - cost_in_cents;
+
+        //check whether the payment is equal to, less than, or greater than, the cost
+        if cost_in_cents == payment_in_cents {
+            println!("CORRECT AMOUNT, THANK YOU.");
+            continue;
+        }
+        else if payment_in_cents < cost_in_cents{ //amount_owed_in_cents is less than 0
+            println!(
+                "SORRY, YOU HAVE SHORT-CHANGED ME ${}.{}",
+                -amount_owed_in_cents/100,//leading digits
+                -amount_owed_in_cents%100,//trailing digits
+            );
+            continue;
+        }
+        else {
+            println!("YOUR CHANGE, ${}.{}", amount_owed_in_cents/100, amount_owed_in_cents%100);
+        }
+
+        //calculate change due
+        //hundred dollar bills owed
+        hundred = amount_owed_in_cents / (100*100);
+        if hundred > 0 {println!("HUNDRED DOLLAR BILL(S): {}", hundred);}
+        amount_owed_in_cents = amount_owed_in_cents % (100*100);
+
+        //fifty dollar bills owed
+        fifty = amount_owed_in_cents / (50*100);
+        if fifty > 0 {println!("FIFTY DOLLAR BILL(S): {}", fifty);}
+        amount_owed_in_cents = amount_owed_in_cents % (50*100);
+
+        //twenty dollar bills owed
+        twenty = amount_owed_in_cents / (20*100);
+        if twenty > 0 {println!("TWENTY DOLLAR BILL(S): {}", twenty);}
+        amount_owed_in_cents = amount_owed_in_cents % (20*100);
+
+        //ten dollar bills owed
+        ten = amount_owed_in_cents / (10*100);
+        if ten > 0 {println!("TEN DOLLAR BILL(S): {}", ten);}
+        amount_owed_in_cents = amount_owed_in_cents % (10*100);
+
+        //five dollar bills owed
+        five = amount_owed_in_cents / (5*100);
+        if five > 0 {println!("FIVE DOLLAR BILL(S): {}", five);}
+        amount_owed_in_cents = amount_owed_in_cents % (5*100);
+
+        //one dollar bills owed
+        one = amount_owed_in_cents / (1*100);
+        if one > 0 {println!("ONE DOLLAR BILL(S): {}", one);}
+        amount_owed_in_cents = amount_owed_in_cents % (1*100);
+
+        //quarters owed
+        quarters = amount_owed_in_cents / 25;
+        if quarters > 0 {println!("QUARTER(S): {}", quarters);}
+        amount_owed_in_cents = amount_owed_in_cents % 25;
+
+        //dimes owed
+        dimes = amount_owed_in_cents / 10;
+        if dimes > 0 {println!("DIME(S): {}", dimes);}
+        amount_owed_in_cents = amount_owed_in_cents % 10;
+
+        //nickles owed
+        nickles = amount_owed_in_cents / 5;
+        if nickles > 0 {println!("NICKEL(S): {}", nickles);}
+        amount_owed_in_cents = amount_owed_in_cents % 5;
+
+        //pennies owed
+        pennies = amount_owed_in_cents / 1;
+        if pennies > 0 {println!("PENNY(S): {}", pennies);}
+
+        //print ending message
+        println!("THANK YOU, COME AGAIN.\n\n");
+    }
+}
+
+/**
+ * print welcome message
+ */
+fn welcome() {
+    println!("\t\t\t\tCHANGE\n\t      CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY\n\n\n");
+}
+
+/**
+ * get number of money from user input
+ */
+fn get_dollar_value_in_cents_from_user(prompt:&str) -> i16 {
+    let mut value:i16;
+    //input loop
+    loop {
+        //data
+        let mut raw_input = String::new();
+
+        //print prompt
+        print!("{}",prompt);
+        //flush std out // allows prompt to be on same line as input
+        stdout().flush().expect("failed to flush");
+
+        //get input
+        io::stdin().read_line(&mut raw_input).expect("failed to read input");
+        //filter out characters that aren't numbers or '.'
+        let mut no_prior_periods = true;
+        raw_input = raw_input.chars().filter(|c| {
+            if c.eq_ignore_ascii_case(&'.') && no_prior_periods {
+                no_prior_periods = false;
+                true
+            } else {
+                c.is_ascii_digit()
+            }
+        }).collect();
+
+        //should only be (at most) 1 .
+        if !raw_input.contains(".") { raw_input += ".00";} //if there are none, add one
+
+        //ensure there are at least 2 trailing digits
+        if raw_input[raw_input.find('.').unwrap_or(raw_input.len())..].len() <= 2 { //if a slice of the string from the . onwards is less than or equal to 2, add two 0's to the end
+            raw_input += "00"
+        }
+        //truncate the trailing digits to 2 digits
+        raw_input = raw_input[..=raw_input.find('.').unwrap_or(raw_input.len()-2)+2].to_string(); //raw_input = a slice of raw_input from the start to 2 past the . 
+        
+        //remove the '.' and convert the string to an integer
+        raw_input = raw_input.chars().filter(|c| c.is_ascii_digit()).collect();
+        match raw_input.parse::<i16>().ok() {
+            Some(v) => {value = v;}
+            None => {
+                println!("INPUT OUTSIDE OF ACCEPTABLE RANGE, TRY AGAIN");
+                continue;
+            },
+        }
+
+        //println!("{}",value);
+
+        if value <= 0 {continue;}
+        else {return value;}
+    }
+}