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+    <h1 id="firstHeading" class="firstHeading">isspace</h1>            <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;ctype.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl"> <td class="t-dcl-nopad"> <pre data-language="c">int isspace( int ch );</pre>
+</td> <td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr>  </table> <p>Checks if the given character is either</p>
+<ul>
+<li> A standard white-space character: </li>
+<ul>
+<li> Space (<span class="nu12">0x20</span>, <code>' '</code>), </li>
+<li> Form feed (<span class="nu12">0x0c</span>, <code>'\f'</code>), </li>
+<li> Line feed (<span class="nu12">0x0a</span>, <code>'\n'</code>), </li>
+<li> Carriage return (<span class="nu12">0x0d</span>, <code>'\r'</code>), </li>
+<li> Horizontal tab (<span class="nu12">0x09</span>, <code>'\t'</code>), </li>
+<li> Vertical tab (<span class="nu12">0x0b</span>, <code>'\v'</code>), </li>
+</ul>
+<li> Or a locale-specific white-space character. </li>
+</ul>   <p>The behavior is undefined if the value of <code>ch</code> is not representable as <code>unsigned char</code> and is not equal to <code><a href="../../io" title="c/io">EOF</a></code>.</p>
+<h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> ch </td> <td> - </td> <td> character to classify </td>
+</tr>
+</table> <h3 id="Return_value"> Return value</h3> <p>Non-zero value if the character is a whitespace character, zero otherwise.</p>
+<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;ctype.h&gt;
+#include &lt;limits.h&gt;
+#include &lt;stdio.h&gt;
+ 
+int main(void)
+{
+    for (int ndx = 0; ndx &lt;= UCHAR_MAX; ndx++)
+        if (isspace(ndx))
+            printf("0x%02x ", ndx);
+}</pre></div> <p>Output:</p>
+<div class="text source-text"><pre data-language="c">0x09 0x0a 0x0b 0x0c 0x0d 0x20</pre></div> </div> <h3 id="References"> References</h3>  <ul>
+<li> C23 standard (ISO/IEC 9899:2023): </li>
+<ul><li> 7.4.1.10 The isspace function (p: TBD) </li></ul>
+<li> C17 standard (ISO/IEC 9899:2018): </li>
+<ul><li> 7.4.1.10 The isspace function (p: 147) </li></ul>
+<li> C11 standard (ISO/IEC 9899:2011): </li>
+<ul><li> 7.4.1.10 The isspace function (p: 202-203) </li></ul>
+<li> C99 standard (ISO/IEC 9899:1999): </li>
+<ul><li> 7.4.1.10 The isspace function (p: 183-184) </li></ul>
+<li> C89/C90 standard (ISO/IEC 9899:1990): </li>
+<ul><li> 4.3.1.9 The isspace function </li></ul>
+</ul>                   <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="../wide/iswspace" title="c/string/wide/iswspace"> <span class="t-lines"><span>iswspace</span></span></a></div>
+<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div> </td> <td> checks if a wide character is a space character <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/string/byte/isspace" title="cpp/string/byte/isspace">C++ documentation</a></span> for <code>isspace</code> </td>
+</tr> </table> <table class="wikitable"> <tr> <th colspan="3"> ASCII values </th> <th rowspan="2"> characters </th> <th rowspan="2"> <p><a href="iscntrl" title="c/string/byte/iscntrl"><code>iscntrl</code></a><br> <a href="../wide/iswcntrl" title="c/string/wide/iswcntrl"><code>iswcntrl</code></a></p>
+</th> <th rowspan="2"> <p><a href="isprint" title="c/string/byte/isprint"><code>isprint</code></a><br> <a href="../wide/iswprint" title="c/string/wide/iswprint"><code>iswprint</code></a></p>
+</th> <th rowspan="2"> <p><strong class="selflink"><code>isspace</code></strong><br> <a href="../wide/iswspace" title="c/string/wide/iswspace"><code>iswspace</code></a></p>
+</th> <th rowspan="2"> <p><a href="isblank" title="c/string/byte/isblank"><code>isblank</code></a><br> <a href="../wide/iswblank" title="c/string/wide/iswblank"><code>iswblank</code></a></p>
+</th> <th rowspan="2"> <p><a href="isgraph" title="c/string/byte/isgraph"><code>isgraph</code></a><br> <a href="../wide/iswgraph" title="c/string/wide/iswgraph"><code>iswgraph</code></a></p>
+</th> <th rowspan="2"> <p><a href="ispunct" title="c/string/byte/ispunct"><code>ispunct</code></a> <br> <a href="../wide/iswpunct" title="c/string/wide/iswpunct"><code>iswpunct</code></a></p>
+</th> <th rowspan="2"> <p><a href="isalnum" title="c/string/byte/isalnum"><code>isalnum</code></a> <br> <a href="../wide/iswalnum" title="c/string/wide/iswalnum"><code>iswalnum</code></a></p>
+</th> <th rowspan="2"> <p><a href="isalpha" title="c/string/byte/isalpha"><code>isalpha</code></a> <br> <a href="../wide/iswalpha" title="c/string/wide/iswalpha"><code>iswalpha</code></a></p>
+</th> <th rowspan="2"> <p><a href="isupper" title="c/string/byte/isupper"><code>isupper</code></a><br> <a href="../wide/iswupper" title="c/string/wide/iswupper"><code>iswupper</code></a></p>
+</th> <th rowspan="2"> <p><a href="islower" title="c/string/byte/islower"><code>islower</code></a><br> <a href="../wide/iswlower" title="c/string/wide/iswlower"><code>iswlower</code></a></p>
+</th> <th rowspan="2"> <p><a href="isdigit" title="c/string/byte/isdigit"><code>isdigit</code></a><br> <a href="../wide/iswdigit" title="c/string/wide/iswdigit"><code>iswdigit</code></a></p>
+</th> <th rowspan="2"> <p><a href="isxdigit" title="c/string/byte/isxdigit"><code>isxdigit</code></a><br> <a href="../wide/iswxdigit" title="c/string/wide/iswxdigit"><code>iswxdigit</code></a></p>
+</th>
+</tr> <tr> <th> decimal </th> <th> hexadecimal </th> <th> octal </th>
+</tr> <tr> <td> 0–8 </td> <td> <code>\x0</code>–<code>\x8</code> </td> <td> <code>\0</code>–<code>\10</code> </td> <td> control codes (<code>NUL</code>, etc.) </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr> <tr> <td> 9 </td> <td> <code>\x9</code> </td> <td> <code>\11</code> </td> <td> tab (<code>\t</code>) </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr> <tr> <td> 10–13 </td> <td> <code>\xA</code>–<code>\xD</code> </td> <td> <code>\12</code>–<code>\15</code> </td> <td> whitespaces (<code>\n</code>, <code>\v</code>, <code>\f</code>, <code>\r</code>) </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr> <tr> <td> 14–31 </td> <td> <code>\xE</code>–<code>\x1F</code> </td> <td> <code>\16</code>–<code>\37</code> </td> <td> control codes </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr> <tr> <td> 32 </td> <td> <code>\x20</code> </td> <td> <code>\40</code> </td> <td> space </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr> <tr> <td> 33–47 </td> <td> <code>\x21</code>–<code>\x2F</code> </td> <td> <code>\41</code>–<code>\57</code> </td> <td> <code>!"#$%&amp;'()*+,-./</code> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr> <tr> <td> 48–57 </td> <td> <code>\x30</code>–<code>\x39</code> </td> <td> <code>\60</code>–<code>\71</code> </td> <td> <code>0123456789</code> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td>
+</tr> <tr> <td> 58–64 </td> <td> <code>\x3A</code>–<code>\x40</code> </td> <td> <code>\72</code>–<code>\100</code> </td> <td> <code>:;&lt;=&gt;?@</code> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr> <tr> <td> 65–70 </td> <td> <code>\x41</code>–<code>\x46</code> </td> <td> <code>\101</code>–<code>\106</code> </td> <td> <code>ABCDEF</code> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td>
+</tr> <tr> <td> 71–90 </td> <td> <code>\x47</code>–<code>\x5A</code> </td> <td> <code>\107</code>–<code>\132</code> </td> <td> <code>GHIJKLMNOP</code><br><code>QRSTUVWXYZ</code> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr> <tr> <td> 91–96 </td> <td> <code>\x5B</code>–<code>\x60</code> </td> <td> <code>\133</code>–<code>\140</code> </td> <td> <code>[\]^_`</code> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr> <tr> <td> 97–102 </td> <td> <code>\x61</code>–<code>\x66</code> </td> <td> <code>\141</code>–<code>\146</code> </td> <td> <code>abcdef</code> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td>
+</tr> <tr> <td> 103–122 </td> <td> <code>\x67</code>–<code>\x7A</code> </td> <td> <code>\147</code>–<code>\172</code> </td> <td> <code>ghijklmnop</code><br><code>qrstuvwxyz</code> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr> <tr> <td> 123–126 </td> <td> <code>\x7B</code>–<code>\x7E</code> </td> <td> <code>\172</code>–<code>\176</code> </td> <td> <code>{|}~</code> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr> <tr> <td> 127 </td> <td> <code>\x7F</code> </td> <td> <code>\177</code> </td> <td> backspace character (<code>DEL</code>) </td> <td class="table-yes">
+<b><code>≠0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td> <td class="table-no"> <b><code>0</code></b> </td>
+</tr>
+</table>           <div class="_attribution">
+  <p class="_attribution-p">
+    &copy; cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br>
+    <a href="https://en.cppreference.com/w/c/string/byte/isspace" class="_attribution-link">https://en.cppreference.com/w/c/string/byte/isspace</a>
+  </p>
+</div>