tweak error msgs

f.go

@@ -49,7 +49,7 @@ func main() {
 
 	tokens := strings.Split(input, " ")
 	if len(tokens) != 2 {
-		fmt.Println("Please enter exactly two floats.")
+		fmt.Println("Please enter two floats separated by a space")
 		return
 	}
 	old_low, err1 := strconv.ParseFloat(tokens[0], 64)
@@ -104,6 +104,7 @@ func main() {
 				new_low = 1.0 / new_high
 				new_high = 1.0 / tmp_low
 			default:
+				continue
 			}
 
 		}