Certain flags and modifiers are available with some format controls.
The flags are `_', `-', `^' and `#'. For certain characters X,
%_X is like %X, but padded with blanks; %-X is like %X,
-ut without padding. %^X is like %X but with all textual
-characters up-cased; %#X is like %X but with letter-case of
+but without padding. %^X is like %X, but with all textual
+characters up-cased; %#X is like %X, but with letter-case of
all textual characters reversed.
%NX (where N stands for an integer) is like %X,
but takes up at least N (a number) positions.