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| <h4 class="subsection">12.14.3 Table of Input Conversions</h4> |
| |
| <p><a name="index-input-conversions_002c-for-_0040code_007bscanf_007d-1081"></a> |
| Here is a table that summarizes the various conversion specifications: |
| |
| <dl> |
| <dt>‘<samp><span class="samp">%d</span></samp>’<dd>Matches an optionally signed integer written in decimal. See <a href="Numeric-Input-Conversions.html#Numeric-Input-Conversions">Numeric Input Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%i</span></samp>’<dd>Matches an optionally signed integer in any of the formats that the C |
| language defines for specifying an integer constant. See <a href="Numeric-Input-Conversions.html#Numeric-Input-Conversions">Numeric Input Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%o</span></samp>’<dd>Matches an unsigned integer written in octal radix. |
| See <a href="Numeric-Input-Conversions.html#Numeric-Input-Conversions">Numeric Input Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%u</span></samp>’<dd>Matches an unsigned integer written in decimal radix. |
| See <a href="Numeric-Input-Conversions.html#Numeric-Input-Conversions">Numeric Input Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%x</span></samp>’, ‘<samp><span class="samp">%X</span></samp>’<dd>Matches an unsigned integer written in hexadecimal radix. |
| See <a href="Numeric-Input-Conversions.html#Numeric-Input-Conversions">Numeric Input Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%e</span></samp>’, ‘<samp><span class="samp">%f</span></samp>’, ‘<samp><span class="samp">%g</span></samp>’, ‘<samp><span class="samp">%E</span></samp>’, ‘<samp><span class="samp">%G</span></samp>’<dd>Matches an optionally signed floating-point number. See <a href="Numeric-Input-Conversions.html#Numeric-Input-Conversions">Numeric Input Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%s</span></samp>’<dd> |
| Matches a string containing only non-whitespace characters. |
| See <a href="String-Input-Conversions.html#String-Input-Conversions">String Input Conversions</a>. The presence of the ‘<samp><span class="samp">l</span></samp>’ modifier |
| determines whether the output is stored as a wide character string or a |
| multibyte string. If ‘<samp><span class="samp">%s</span></samp>’ is used in a wide character function the |
| string is converted as with multiple calls to <code>wcrtomb</code> into a |
| multibyte string. This means that the buffer must provide room for |
| <code>MB_CUR_MAX</code> bytes for each wide character read. In case |
| ‘<samp><span class="samp">%ls</span></samp>’ is used in a multibyte function the result is converted into |
| wide characters as with multiple calls of <code>mbrtowc</code> before being |
| stored in the user provided buffer. |
| |
| <br><dt>‘<samp><span class="samp">%S</span></samp>’<dd>This is an alias for ‘<samp><span class="samp">%ls</span></samp>’ which is supported for compatibility |
| with the Unix standard. |
| |
| <br><dt>‘<samp><span class="samp">%[</span></samp>’<dd>Matches a string of characters that belong to a specified set. |
| See <a href="String-Input-Conversions.html#String-Input-Conversions">String Input Conversions</a>. The presence of the ‘<samp><span class="samp">l</span></samp>’ modifier |
| determines whether the output is stored as a wide character string or a |
| multibyte string. If ‘<samp><span class="samp">%[</span></samp>’ is used in a wide character function the |
| string is converted as with multiple calls to <code>wcrtomb</code> into a |
| multibyte string. This means that the buffer must provide room for |
| <code>MB_CUR_MAX</code> bytes for each wide character read. In case |
| ‘<samp><span class="samp">%l[</span></samp>’ is used in a multibyte function the result is converted into |
| wide characters as with multiple calls of <code>mbrtowc</code> before being |
| stored in the user provided buffer. |
| |
| <br><dt>‘<samp><span class="samp">%c</span></samp>’<dd>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 <a href="String-Input-Conversions.html#String-Input-Conversions">String Input Conversions</a>. |
| |
| <p>If the ‘<samp><span class="samp">%c</span></samp>’ 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 <code>MB_CUR_MAX</code> bytes for each character. If ‘<samp><span class="samp">%lc</span></samp>’ 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 <code>mbrtowc</code>. |
| |
| <br><dt>‘<samp><span class="samp">%C</span></samp>’<dd>This is an alias for ‘<samp><span class="samp">%lc</span></samp>’ which is supported for compatibility |
| with the Unix standard. |
| |
| <br><dt>‘<samp><span class="samp">%p</span></samp>’<dd>Matches a pointer value in the same implementation-defined format used |
| by the ‘<samp><span class="samp">%p</span></samp>’ output conversion for <code>printf</code>. See <a href="Other-Input-Conversions.html#Other-Input-Conversions">Other Input Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%n</span></samp>’<dd>This conversion doesn't read any characters; it records the number of |
| characters read so far by this call. See <a href="Other-Input-Conversions.html#Other-Input-Conversions">Other Input Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%%</span></samp>’<dd>This matches a literal ‘<samp><span class="samp">%</span></samp>’ character in the input stream. No |
| corresponding argument is used. See <a href="Other-Input-Conversions.html#Other-Input-Conversions">Other Input Conversions</a>. |
| </dl> |
| |
| <p>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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