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Built-in Functions
argument. When variables are used this string must be a constant. The %
character is used within the string to indicate a variable value is to be formatted
and output. Longs in the printf may be 16 or 32 bit. A %% will output a single
%. Formatting rules for the % follows.
See the Expressions > Constants and Trigraph sections of this manual for other
escape character that may be part of the string.
If fprintf() is used then the specified stream is used where printf() defaults to
STDOUT (the last USE RS232).
Format:
The format takes the generic form %nt. n is optional and may be 1-9 to specify how
many characters are to be outputted, or 01-09 to indicate leading zeros, or 1.1 to
9.9 for floating point and %w output. t is the type and may be one of the following:
c
s
u
d
Lu
Ld
x
X
Lx
LX
f
g
e
w
Character
String or character
Unsigned int
Signed int
Long unsigned int
Long signed int
Hex int (lower case)
Hex int (upper case)
Hex long int (lower case)
Hex long int (upper case)
Float with truncated decimal
Float with rounded decimal
Float in exponential format
Unsigned int with decimal place inserted.
Specify two numbers for n. The first is a
total field width. The second is the desired
number of decimal places.
Example formats:
Specifier
%03u
%u
%2u
%5
%d
%x
%X
%4X
%3.1w
Value=0x12
018
18
18
18
18
12
12
0012
1.8
Value=0xfe
254
254
*
254
-2
fe
FE
00FE
25.4
* Result is undefined - Assume garbage.
171
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