add asciicast

README.md

@@ -49,6 +49,10 @@ $ sed -u "s|#.*||" | sed -u 's|M|000000|g' | go run f.go
 # ^ piano tuners in Chicago
 ```
 
+You can see a recording in action here:
+
+[![asciicast](https://asciinema.org/a/fygBtg0XDc1iVajArdQn9b9CA.svg)](https://asciinema.org/a/fygBtg0XDc1iVajArdQn9b9CA)
+
 ## Installation
 
 ```

f.go

@@ -46,22 +46,38 @@ func main() {
 	var old_low, old_high float64
 	var input string
 	var err1, err2 error
+
+InitialForLoop:
 	for {
 		input, _ = reader.ReadString('\n')
 		input = strings.TrimSpace(input)
 		words := strings.Split(input, " ")
-		if len(words) != 2 {
-			fmt.Println("Please enter two floats separated by a space, like: 1 10")
-			continue
+
+		switch len(words) {
+		case 1:
+			single_float, err1 := strconv.ParseFloat(words[0], 64)
+			if err1 != nil {
+				fmt.Println("Trying to initialize with a scalar, but scalar is not a float")
+				continue InitialForLoop
 			}
+			old_low = single_float
+			old_high = single_float
+		case 2:
 			old_low, err1 = strconv.ParseFloat(words[0], 64)
 			old_high, err2 = strconv.ParseFloat(words[1], 64)
+			if err1 != nil || err2 != nil {
+				fmt.Println("Trying to initialize with a distribution, but distribution is not specified as two floats")
+				continue InitialForLoop
+			}
+		default:
+			fmt.Println("Please enter two floats separated by a space, like: 1 10")
+			continue InitialForLoop
+		}
 		if err1 != nil || err2 != nil {
 			fmt.Println("Please enter two floats separated by a space, like: 1 10")
 			continue
 		}
 		break
-
 	}
 	fmt.Printf("=> %.1f %.1f\n", old_low, old_high)