📄 stdstring_details.html
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<a name="ispunct">ispunct</a></span></h2>
<p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p>
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<pre><span lang="EN-US"> <o:p>
</o:p>
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<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>#include <ctype.h></span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>int ispunct( int ch );</span></pre>
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<p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：如果参数是除字母，数字和空格外可打印字符，函数返回非零值，否则返回零值。</p>
<p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br>
<strong><a href="#isalnum">isalnum()</a>, <a href="#isalpha">isalpha()</a>, <a href="#iscntrl">iscntrl()</a>,
<a href="#isdigit">isdigit()</a>, <a href="#isgraph">isgraph()</a>, <a href="#isprint">isprint()</a>,
and <a href="#isspace">isspace()</a>.</strong></span></p>
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<span lang="EN-US">
<hr align="center" width="100%" SIZE="2">
</span>
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<h2 style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US">
<a name="isspace">isspace</a></span></h2>
<p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p>
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<pre><span lang="EN-US"> <o:p>
</o:p>
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<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>#include <ctype.h></span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>int isspace( int ch );</span></pre>
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<p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：如果参数是空格类字符（即：单空格，制表符，垂直制表符，满页符，回车符，新行符），函数返回非零值，否则返回零值。</p>
<p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br>
<strong><a href="#isalnum">isalnum()</a>, <a href="#isalpha">isalpha()</a>, <a href="#iscntrl">iscntrl()</a>,
<a href="#isdigit">isdigit()</a>, <a href="#isgraph">isgraph()</a>, and <a href="#ispunct">ispunct()</a>.</strong></span></p>
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<span lang="EN-US">
<hr align="center" width="100%" SIZE="2">
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<h2 style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US">
<a name="isupper">isupper</a></span></h2>
<p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p>
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<pre><span lang="EN-US"> <o:p>
</o:p>
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<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>#include <ctype.h></span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>int isupper( int ch );</span></pre>
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<p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：如果参数是大写字母字符，函数返回非零值，否则返回零值。</p>
<p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br>
<strong><a href="#tolower">tolower()</a></strong></span></p>
<div class="MsoNormal" style="TEXT-ALIGN: center; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align="center">
<span lang="EN-US">
<hr align="center" width="100%" SIZE="2">
</span>
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<h2 style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US">
<a name="isxdigit">isxdigit</a></span></h2>
<p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p>
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<pre><span lang="EN-US"> <o:p>
</o:p>
</span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>#include <ctype.h></span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>int isxdigit( int ch );</span></pre>
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<p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：如果参数是十六进制数字字符（即：<span lang="EN-US">A-F,
a-f, 0-9），函数返回非零值，否则返回零值。</span></p>
<p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br>
<strong><a href="#isalnum">isalnum()</a>, <a href="#isalpha">isalpha()</a>, <a href="#iscntrl">iscntrl()</a>,
<a href="#isdigit">isdigit()</a>, <a href="#isgraph">isgraph()</a>, <a href="#ispunct">ispunct()</a>,
and <a href="#isspace">isspace()</a>.</strong></span></p>
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<span lang="EN-US">
<hr align="center" width="100%" SIZE="2">
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<h2 style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US">
<a name="memchr">memchr</a></span></h2>
<p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p>
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<pre><span lang="EN-US"> <o:p>
</o:p>
</span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>#include <string.h></span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>void *memchr( const void *buffer, int ch, size_t count );</span></pre>
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<p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：函数在<i><span lang="EN-US">buffer</span></i>指向的数组的<i><span lang="EN-US">count</span></i>个字符的字符串里查找<i><span lang="EN-US">ch</span></i><span lang="EN-US">
首次出现的位置。返回一个指针，指向<i>ch</i>
在字符串中首次出现的位置, 如果<i>ch</i>
没有在字符串中找到，返回NULL。例如:</span></p>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>char names[] = "Alan Bob Chris X Dave";</span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>if( memchr(names,'X',strlen(names)) == NULL )</span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>printf( "Didn't find an X\n" );</span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>else</span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>printf( "Found an X\n" );</span></pre>
<p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br>
<strong><a href="#memcpy">memcpy()</a> and <a href="#strstr">strstr()</a>.</strong></span></p>
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<span lang="EN-US">
<hr align="center" width="100%" SIZE="2">
</span>
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<a name="memcmp">memcmp</a></span></h2>
<p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p>
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<pre><span lang="EN-US"> <o:p>
</o:p>
</span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>#include <string.h></span></pre>
<pre><span lang="EN-US"><span style="mso-spacerun: yes"> </span>int memcmp( const void *buffer1, const void *buffer2, size_t count );</span></pre>
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