b
$ b

You want

function is_Weekday ( dayOfTheWeek: in Day_Of_The_Week) return Boolean is
begin
    return dayoFTheWeek in Weekday;
end is_Weekday;

此外，您还需要'Val code>

$ c>在

Also, you want ’Val not ’Pos in

selected_day := Day_Of_The_Week'val(selected_day_value);

，你可以看看第二个 Put_Line ！

and you might take a look at the words in the second Put_Line!