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+    <h1 id="firstHeading" class="firstHeading">toupper</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 toupper( int ch );</pre>
+</td> <td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr>  </table> <p>Converts the given character to uppercase according to the character conversion rules defined by the currently installed C locale.</p>
+<p>In the default "C" locale, the following lowercase letters <code>abcdefghijklmnopqrstuvwxyz</code> are replaced with respective uppercase letters <code>ABCDEFGHIJKLMNOPQRSTUVWXYZ</code>.</p>
+<h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> ch </td> <td> - </td> <td> character to be converted. If the value of <code>ch</code> is not representable as <code>unsigned char</code> and does not equal <code><a href="http://en.cppreference.com/w/c/io"><span class="kw888">EOF</span></a></code>, the behavior is undefined. </td>
+</tr>
+</table> <h3 id="Return_value"> Return value</h3> <p>Uppercase version of <code>ch</code> or unmodified <code>ch</code> if no uppercase version is listed in the current C locale.</p>
+<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;stdio.h&gt;
+#include &lt;ctype.h&gt;
+#include &lt;locale.h&gt;
+#include &lt;limits.h&gt;
+ 
+int main(void)
+{
+    /* In the default locale: */
+    for (unsigned char l = 0; l &lt; UCHAR_MAX; l++) {
+        unsigned char u = toupper(l);
+        if (u != l) printf("%c%c ", l, u);
+    }
+    printf("\n\n");
+ 
+    unsigned char c = '\xb8'; // the character Ž in ISO-8859-15
+                              // but ´ (acute accent) in ISO-8859-1 
+    setlocale(LC_ALL, "en_US.iso88591");
+    printf("in iso8859-1, toupper('0x%x') gives 0x%x\n", c, toupper(c));
+    setlocale(LC_ALL, "en_US.iso885915");
+    printf("in iso8859-15, toupper('0x%x') gives 0x%x\n", c, toupper(c));
+}</pre></div> <p>Possible output:</p>
+<div class="text source-text"><pre data-language="c">aA bB cC dD eE fF gG hH iI jJ kK lL mM nN oO pP qQ rR sS tT uU vV wW xX yY zZ 
+ 
+in iso8859-1, toupper('0xb8') gives 0xb8
+in iso8859-15, toupper('0xb8') gives 0xb4</pre></div> </div> <h3 id="References"> References</h3>  <ul>
+<li> C17 standard (ISO/IEC 9899:2018): </li>
+<ul><li> 7.4.2.2 The toupper function (p: 147-148) </li></ul>
+<li> C11 standard (ISO/IEC 9899:2011): </li>
+<ul><li> 7.4.2.2 The toupper function (p: 204) </li></ul>
+<li> C99 standard (ISO/IEC 9899:1999): </li>
+<ul><li> 7.4.2.2 The toupper function (p: 185) </li></ul>
+<li> C89/C90 standard (ISO/IEC 9899:1990): </li>
+<ul><li> 4.3.2.2 The toupper function </li></ul>
+</ul>               <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="tolower" title="c/string/byte/tolower"> <span class="t-lines"><span>tolower</span></span></a></div> </td> <td> converts a character to lowercase <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td> <div><a href="../wide/towupper" title="c/string/wide/towupper"> <span class="t-lines"><span>towupper</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> converts a wide character to uppercase <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/toupper" title="cpp/string/byte/toupper">C++ documentation</a></span> for <code>toupper</code> </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/toupper" class="_attribution-link">https://en.cppreference.com/w/c/string/byte/toupper</a>
+  </p>
+</div>