From cc905b5d5ab76a28ffafa195f23f743bdc0f6bed Mon Sep 17 00:00:00 2001
From: Julio Biason <julio.biason@pm.me>
Date: Fri, 28 Aug 2020 09:20:56 -0300
Subject: [PATCH] Testing const fn

---
 const.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 const.rs

diff --git a/const.rs b/const.rs
new file mode 100644
index 0000000..9133207
--- /dev/null
+++ b/const.rs
@@ -0,0 +1,20 @@
+use std::io::stdin;
+
+const fn double(x: i32) -> i32 {
+    x * 2
+}
+
+const FIVE: i32 = 5;
+const TEN: i32 = double(FIVE);
+
+fn main() {
+    assert_eq!(5, FIVE);
+    assert_eq!(10, double(FIVE));
+
+    println!("Your const is {}", double(10));
+
+    let mut s = String::new();
+    stdin().read_line(&mut s).unwrap();
+
+    println!("Your double: {}", double(s.trim().parse::<i32>().unwrap()));
+}