Initial commit

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "combination_lock"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand="0.8.4"

src/main.rs

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+#![allow(dead_code)]
+#![allow(unused_imports)]
+#![allow(unused_must_use)]
+
+use rand::{thread_rng, Rng};
+use std::io::stdin;
+
+enum State {
+    Locked,
+    Failed,
+    Unlocked
+}
+
+fn main() {
+    let mut rng = thread_rng();
+    let x: u32 = rng.gen_range(0..10000);
+    let code = String::from(x.to_string());
+    let mut state = State::Locked;
+    let mut entry = String::new();
+
+    loop {
+        match state {
+            State::Locked => {
+                let mut input = String::new();
+                match stdin().read_line(&mut input) {
+                    Ok(_) => {
+                        entry.push_str(&input.trim_end());
+                    }
+                    Err(_) => continue
+                }
+
+                if entry == code {
+                    state = State::Unlocked;
+                    continue;
+                }
+
+                if !code.starts_with(&entry) {
+                    state = State::Failed;
+                }
+            }
+            State::Failed => {
+                println!("Failed");
+                entry.clear();
+                state = State::Locked;
+                continue;
+            }
+            State::Unlocked => {
+                println!("UNLOCKED");
+                return;
+            }
+        }
+    }
+}