Initial data commit

Task/Gray-code/Icon/gray-code.icon

@@ -0,0 +1,18 @@
+link bitint
+
+procedure main()
+    every write(right(i := 0 to 10,4),":",right(int2bit(i),10)," -> ",
+                                          right(g := gEncode(i),10)," -> ",
+                                          right(b := gDecode(g),10)," -> ",
+                                          right(bit2int(b),10))
+end
+
+procedure gEncode(b)
+    return int2bit(ixor(b, ishift(b,-1)))
+end
+
+procedure gDecode(g)
+    b := g[1]
+    every i := 2 to *g do b ||:= if g[i] == b[i-1] then "0" else "1"
+    return b
+end