sprintf_Tutorial

quick lookup guide for using the sprintf function

[Specifier]

Character	Data Type	Example
d or i	Signed decimal integer	392
u	Unsigned decimal integer	7235
o	Unsigned octal	610
x	Unsigned hexadecimal integer	7fa
X	Unsigned hexadecimal integer (uppercase)	7FA
f	Decimal floating point, lowercase	392.65
F	Decimal floating point, uppercase	392.65
e	Scientific notation (mantissa/exponent), lowercase	3.9265e+2
E	Scientific notation (mantissa/exponent), uppercase	3.9265E+2
g	Use the shortest representation: %e or %f	392.65
G	Use the shortest representation: %E or %F	392.65
a	Hexadecimal floating point, lowercase	-0xc.90fep-2
A	Hexadecimal floating point, uppercase	-0XC.90FEP-2
c	Character	a
s	String of characters	sample
p	Pointer address	b8000000
n	Nothing printed.
lu	Unsigned LONG

• The corresponding argument must be a pointer to a signed int.
• The number of characters written so far is stored in the pointed location.
• % A % followed by another % character will write a single % to the stream. %

[Flags]

Character	Action	Notes
-	Left-Justify
+	Force sign	(- or +)
" " (space)	No Sign
#	add leading zeros	(in specific cases). with floats forces decimal point
0	Left Pad with Zeros

[Width]

Character	Action	Notes
(number)	Number of characters printed.	Padded with spaces
*	width is not specified but passed as an additional integer	as an argument *eg:

 int widthValue = 20;
 sprintf(screenBuffer[3], "%*c", widthValue, downArrow);

[Precision]

Character	Action	Notes
.(number)	for integers number of digits, for floats number of digets after decimal	defaults to 1
.*	precision not specified but passed as additional int value

[Length]

Character	Action	Notes
h	short int
I	long int or unsigned int
L	Long Double (only floating points)

% [Flags] [Width] [.Precision] [Length] [Specifier]

% [Flags] [Width] [.Precision] [Length] [Specifier]

ASCII Help

ASCII Value Range	Character Type	Notes
32:	" " space
33 - 47	Punctuation
48 - 57	0 to 9
58 - 64	Punctuation
65 - 90	A - Z
91 - 96	Punctuation
97 -