sol(rust): pset1/cash

rust/pset1/cash/Cargo.toml

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

rust/pset1/cash/README.md

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+../../../pset1/cash/README.md

rust/pset1/cash/src/lib.rs

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+use std::io::{self, Write};
+
+pub fn get_int(prompt: &str) -> i32 {
+    loop {
+        print!("{prompt}");
+        io::stdout().flush().unwrap();
+
+        let mut input_text = String::new();
+        match io::stdin().read_line(&mut input_text) {
+            Ok(_) => match input_text.trim().parse() {
+                Ok(input_int) => return input_int,
+                Err(_) => continue,
+            },
+            Err(_) => continue,
+        }
+    }
+}

rust/pset1/cash/src/main.rs

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+use cash::get_int;
+
+fn main() {
+    let mut cents = loop {
+        let x = get_int("Change owed: ");
+        if x >= 0 {
+            break x;
+        }
+    };
+
+    let quarters = calculate_quarters(cents);
+    cents -= quarters * 25;
+
+    let dimes = calculate_dimes(cents);
+    cents -= dimes * 10;
+
+    let nickels = calculate_nickels(cents);
+    cents -= nickels * 5;
+
+    let pennies = calculate_pennies(cents);
+
+    println!("{}", quarters + dimes + nickels + pennies);
+}
+
+fn calculate_quarters(cents: i32) -> i32 {
+    cents / 25
+}
+
+fn calculate_dimes(cents: i32) -> i32 {
+    cents / 10
+}
+
+fn calculate_nickels(cents: i32) -> i32 {
+    cents / 5
+}
+
+fn calculate_pennies(cents: i32) -> i32 {
+    cents
+}