CHOICE--Note

ERRORLEVEL parameters

The first key you assign returns a value of 1, the second a value of 2, the
third a value of 3, and so on. If the user presses a key that is not among
the keys you assigned, CHOICE sounds a warning beep (that is, it sends a
BEL, or 07h, character to the console).

If CHOICE detects an error condition, it returns an ERRORLEVEL value of 255.
If the user presses CTRL+BREAK or CTRL+C, CHOICE returns an ERRORLEVEL value
of 0.

When you use ERRORLEVEL parameters in a batch program, list them in
decreasing order.