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Here is a table that summarizes the various conversion specifications:
- `%d'
-
Matches an optionally signed integer written in decimal. See section Numeric Input Conversions.
- `%i'
-
Matches an optionally signed integer in any of the formats that the C
language defines for specifying an integer constant. See section Numeric Input Conversions.
- `%o'
-
Matches an unsigned integer written in octal radix.
See section Numeric Input Conversions.
- `%u'
-
Matches an unsigned integer written in decimal radix.
See section Numeric Input Conversions.
- `%x', `%X'
-
Matches an unsigned integer written in hexadecimal radix.
See section Numeric Input Conversions.
- `%e', `%f', `%g', `%E', `%G'
-
Matches an optionally signed floating-point number. See section Numeric Input Conversions.
- `%s'
-
Matches a string containing only non-whitespace characters.
See section String Input Conversions. The presence of the `l' modifier
determines whether the output is stored as a wide character string or a
multibyte string. If `%s' is used in a wide character function the
string is converted as with multiple calls to
wcrtomb
into a
multibyte string. This means that the buffer must provide room for
MB_CUR_MAX
bytes for each wide character read. In case
`%ls' is used in a multibyte function the result is converted into
wide characters as with multiple calls of mbrtowc
before being
stored in the user provided buffer.
- `%S'
-
This is an alias for `%ls' which is supported for compatibility
with the Unix standard.
- `%['
-
Matches a string of characters that belong to a specified set.
See section String Input Conversions. The presence of the `l' modifier
determines whether the output is stored as a wide character string or a
multibyte string. If `%[' is used in a wide character function the
string is converted as with multiple calls to
wcrtomb
into a
multibyte string. This means that the buffer must provide room for
MB_CUR_MAX
bytes for each wide character read. In case
`%l[' is used in a multibyte function the result is converted into
wide characters as with multiple calls of mbrtowc
before being
stored in the user provided buffer.
- `%c'
-
Matches a string of one or more characters; the number of characters
read is controlled by the maximum field width given for the conversion.
See section String Input Conversions.
If the `%c' is used in a wide stream function the read value is
converted from a wide character to the corresponding multibyte character
before storing it. Note that this conversion can produce more than one
byte of output and therefore the provided buffer be large enough for up
to
MB_CUR_MAX
bytes for each character. If `%lc' is used in
a multibyte function the input is treated as a multibyte sequence (and
not bytes) and the result is converted as with calls to mbrtowc
.
- `%C'
-
This is an alias for `%lc' which is supported for compatibility
with the Unix standard.
- `%p'
-
Matches a pointer value in the same implementation-defined format used
by the `%p' output conversion for
printf
. See section Other Input Conversions.
- `%n'
-
This conversion doesn't read any characters; it records the number of
characters read so far by this call. See section Other Input Conversions.
- `%%'
-
This matches a literal `%' character in the input stream. No
corresponding argument is used. See section Other Input Conversions.
If the syntax of a conversion specification is invalid, the behavior is
undefined. If there aren't enough function arguments provided to supply
addresses for all the conversion specifications in the template strings
that perform assignments, or if the arguments are not of the correct
types, the behavior is also undefined. On the other hand, extra
arguments are simply ignored.
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