Formatter uses a set of format flags to control various aspects of a conversion.
A format flag follows the % in a format specification.
FlagEffect
-Left justification
#Alternate conversion format
0Output is padded with zeros rather than spaces
spacePositive numeric output is preceded by a space
+Positive numeric output is preceded by a + sign
,Numeric values include grouping separators
(Negative numeric values are enclosed within parentheses