I have written a small program along the lines of
the spam salad example.
I have managed to get to the point of if the user inputs an
invalid numeral then they are prompted to re enter a number
between 1 and 3. I now want to do the same thing if any
alpha character or more is entered. at the moment if a alpha
is inputted the program crashes with a script error. What do
I need do to refer the user to the invalid input prompt??