13.5 Case Ranges

You can specify a range of consecutive values in a single case label, like this:

case low ... high:

This has the same effect as the proper number of individual case labels, one for each integer value from low to high, inclusive. This is a non-standard extension to the language. Using this feature reduces your code portability.

This feature is especially useful for ranges of ASCII character codes:

case 'A' ... 'Z':

Be careful: Write spaces around the..., otherwise it may be parsed incorrectly when you use it with integer values. For example, write this:

case 1 ... 5:

rather than this:

case 1...5: