Writing code that terminates with a runtime error is rather unprofessional, so whenever possible, use code that does not create an error. In our game, you could test the type of guessed-number with the following:
if integer? guessed-number
If guessed-number was not an integer, use continue to ask for a next guess:
;-- see Chapter04/guess-number2.red:if not integer? guessed-number [ print ["This is no integer! Try again."] continue]
You could also use the more complicated if (type? guessed-number) <> integer! here, but we strive to make things simpler in Red, remember?
To check whether a value is a number (integer or float), use number? value.
We'll come back to this subject in Chapter 6, Using Functions and Objects, to discuss ...
