Printf Format Directives

These argument formats are recognized by printf:
	%c	Single character.
	%d	Decimal number.
	%e	[-]d.dddddde[+-]ddd
	%f	[-]ddd.dddddd
	%g	%e or %f formatting, whichever is shorter.
	%o	Unsigned octal number.
	%s	String.
	%x	Unsigned hexadecimal number.
	%%	Literal % character.
Additional parameters may lie between the % and the control letter:
	-	Left-justify expression in its field.
	width	Pad field to this width as needed; leading 0 pads with zeros.
	.prec	Maximum string width or digits to right of decimal point.