1 files changed, 27 insertions, 0 deletions
diff --git a/challenge-120/abigail/lua/ch-1.lua b/challenge-120/abigail/lua/ch-1.lua
new file mode 100644
index 0000000000..0d5896f59c
--- /dev/null
+++ b/challenge-120/abigail/lua/ch-1.lua
@@ -0,0 +1,27 @@
+#!/opt/local/bin/lua
+
+--
+-- See ../README.md
+--
+
+--
+-- Run as: lua ch-1.lua < input-file
+--
+
+for line in io . lines () do
+    num = tonumber (line)
+    out = 0
+    for i = 0, 7 do
+        bit = math . floor ((num - (num % (2 ^ i))) / (2 ^ i)) % 2
+        if bit == 1
+        then
+            if i % 2 == 1
+            then
+                out = out + 2 ^ (i - 1)
+            else
+                out = out + 2 ^ (i + 1)
+            end
+        end
+    end
+    print (out)
+end