Just another update

Task/Gray-code/SQL/gray-code.sql

@@ -0,0 +1,32 @@
+DECLARE @binary AS NVARCHAR(MAX) = '001010111'
+DECLARE @gray AS NVARCHAR(MAX) = ''
+
+--Encoder
+SET @gray = LEFT(@binary, 1)
+
+WHILE LEN(@binary) > 1
+  BEGIN
+      IF LEFT(@binary, 1) != SUBSTRING(@binary, 2, 1)
+        SET @gray = @gray + '1'
+      ELSE
+        SET @gray = @gray + '0'
+
+      SET @binary = RIGHT(@binary, LEN(@binary) - 1)
+  END
+
+SELECT @gray
+
+--Decoder
+SET @binary = LEFT(@gray, 1)
+
+WHILE LEN(@gray) > 1
+  BEGIN
+      IF RIGHT(@binary, 1) != SUBSTRING(@gray, 2, 1)
+        SET @binary = @binary + '1'
+      ELSE
+        SET @binary = @binary + '0'
+
+      SET @gray = RIGHT(@gray, LEN(@gray) - 1)
+  END
+
+SELECT @binary