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Standard C Libraries
printf
Description:
Include:
Prototype:
Prints formatted text to stdout .
<stdio.h>
int printf(const char * format , ...);
Arguments:
format
...
format control string
optional arguments
Return Value:
Remarks:
Returns number of characters generated or a negative number if an
error occurs.
There must be exactly the same number of arguments as there are for-
mat specifiers. If the are less arguments than match the format specifi-
ers, the output is undefined. If there are more arguments than match
the format specifiers, the remaining arguments are discarded. Each for-
mat specifier begins with a percent sign followed by optional fields and
a required type as shown here:
%[flags][width][.precision][size]type
flags
-
0
+
space
#
left justify the value within a given field width
Use 0 for the pad character instead of space (which is the
default)
generate a plus sign for positive signed values
generate a space or signed values that have neither a plus
nor a minus sign
to prefix 0 on an octal conversion, to prefix 0x or 0X on a
hexadecimal conversion, or to generate a decimal point and
fraction digits that are otherwise suppressed on a float-
ing-point conversion
width
specify the number of characters to generate for the conversion. If the
asterisk (*) is used instead of a decimal number, the next argument
(which must be of type int ) will be used for the field width. If the result
is less than the field width, pad characters will be used on the left to fill
the field. If the result is greater than the field width, the field is
expanded to accommodate the value without padding.
precision
The field width can be followed with dot (.) and a decimal integer repre-
senting the precision that specifies one of the following:
- minimum number of digits to generate on an integer conversion
- number of fraction digits to generate on an e, E, or f conversion
- maximum number of significant digits to generate on a g or G
conversion
- maximum number of characters to generate from a C string on an s
conversion
If the period appears without the integer the integer is assumed to be
zero. If the asterisk (*) is used instead of a decimal number, the next
argument (which must be of type int) will be used for the precision.
? 2008 Microchip Technology Inc.
DS51456E-page 73
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