From 7edf4a788800c4a7029fed7d7dc9f6f9c78c8636 Mon Sep 17 00:00:00 2001
From: tobyatgithub <toby.fangyuan@gmail.com>
Date: Fri, 22 Oct 2021 16:22:09 -0700
Subject: [PATCH] cache chapter 3.0

---
 projects/variables/Cargo.lock  | 7 +++++++
 projects/variables/Cargo.toml  | 8 ++++++++
 projects/variables/src/main.rs | 8 ++++++++
 3 files changed, 23 insertions(+)
 create mode 100644 projects/variables/Cargo.lock
 create mode 100644 projects/variables/Cargo.toml
 create mode 100644 projects/variables/src/main.rs

diff --git a/projects/variables/Cargo.lock b/projects/variables/Cargo.lock
new file mode 100644
index 00000000..a6daf1d1
--- /dev/null
+++ b/projects/variables/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "variables"
+version = "0.1.0"
diff --git a/projects/variables/Cargo.toml b/projects/variables/Cargo.toml
new file mode 100644
index 00000000..a3acca09
--- /dev/null
+++ b/projects/variables/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "variables"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/projects/variables/src/main.rs b/projects/variables/src/main.rs
new file mode 100644
index 00000000..963b60ac
--- /dev/null
+++ b/projects/variables/src/main.rs
@@ -0,0 +1,8 @@
+fn main() {
+    const MAX_POINTS: u32 = 100_000;
+    // let x = 5;
+    let mut x = 5;
+    println!("The value of x is: {}", x);
+    x = 6;
+    println!("The value of x is: {}", x);
+}