From 525ff6c314c638452055b6e4c3e872a525850a61 Mon Sep 17 00:00:00 2001
From: zhangjiong <zhangjiongwx@outlook.com>
Date: Tue, 8 Aug 2017 17:19:38 +0800
Subject: [PATCH] Add Lua code for chapter 3

---
 03_recursion/lua/01_countdown.lua | 12 ++++++++++++
 03_recursion/lua/02_greet.lua     | 16 ++++++++++++++++
 03_recursion/lua/03_factorial.lua |  9 +++++++++
 3 files changed, 37 insertions(+)
 create mode 100644 03_recursion/lua/01_countdown.lua
 create mode 100644 03_recursion/lua/02_greet.lua
 create mode 100644 03_recursion/lua/03_factorial.lua

diff --git a/03_recursion/lua/01_countdown.lua b/03_recursion/lua/01_countdown.lua
new file mode 100644
index 0000000..beb7d6a
--- /dev/null
+++ b/03_recursion/lua/01_countdown.lua
@@ -0,0 +1,12 @@
+function countdown(i)
+    print(i)
+    -- base case
+    if i <= 0 then
+        return
+    -- recursive case
+    else
+        countdown(i - 1)
+    end
+end
+
+countdown(5)
\ No newline at end of file
diff --git a/03_recursion/lua/02_greet.lua b/03_recursion/lua/02_greet.lua
new file mode 100644
index 0000000..d0efccb
--- /dev/null
+++ b/03_recursion/lua/02_greet.lua
@@ -0,0 +1,16 @@
+function greet2(name)
+    print("how are you, " .. name .. "?")
+end
+
+function bye()
+    print("ok bye!")
+end
+
+function greet(name)
+    print("hello, " .. name .. "!")
+    greet2(name)
+    print("getting ready to say bye...")
+    bye()
+end
+
+greet("adit")
\ No newline at end of file
diff --git a/03_recursion/lua/03_factorial.lua b/03_recursion/lua/03_factorial.lua
new file mode 100644
index 0000000..74ab687
--- /dev/null
+++ b/03_recursion/lua/03_factorial.lua
@@ -0,0 +1,9 @@
+function fact(x)
+    if x <= 1 then
+        return 1
+    else
+        return x * fact(x - 1)
+    end
+end
+
+print(fact(5))
\ No newline at end of file