9.1 Some simple dialogs

The simplest form of dialog is a message dialog. The function display-message behaves very much like format .

Figure 9.1 A message dialog

(display-message

             "This function is ~S"

             'display-message)

Figure 9.2 A second message dialog

Another simple dialog asks the user a question and returns t or nil depending on whether the user has chosen yes or no. This function is confirm-yes-or-no .

(confirm-yes-or-no

    "Do you own a pet?")

Figure 9.3 A message dialog prompting for confirmation