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<td style='padding:.75pt .75pt .75pt .75pt'><pre><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>#include <stdlib.h><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>void *calloc( size_t num, size_t size );<o:p></o:p></span></pre></td>
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<p><span style='mso-bidi-font-size:10.5pt'>功能： 函数返回一个指向</span><i><span
lang=EN-US>num</span></i><span lang=EN-US> 数组空间，每一数组元素的大小为<i>size</i>。如果错误发生返回NULL。
<o:p></o:p></span></p>
<p class=MsoNormal><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="#free">free()</a>, <a href="#malloc">malloc()</a>, and <a
href="#realloc">realloc()</a>. </strong><o:p></o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span lang=EN-US>
<hr size=2 width="100%" align=center>
</span></div>
<h2><span lang=EN-US><a name="free">free</a> <o:p></o:p></span></h2>
<p class=MsoNormal><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><span
lang=EN-US> <o:p></o:p></span></p>
<table border=0 cellpadding=0 bgcolor="#ccccff" style='mso-cellspacing:1.5pt;
background:#CCCCFF'>
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<td style='padding:.75pt .75pt .75pt .75pt'><pre><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>#include <stdlib.h><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>void free( void *ptr );<o:p></o:p></span></pre></td>
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<p><span style='mso-bidi-font-size:10.5pt'>功能： 函数释放指针</span><i><span
lang=EN-US>ptr</span></i>指向的空间，以供以后使用。指针<i><span lang=EN-US>ptr</span></i><span
lang=EN-US> 必须由先前对<a href="#malloc">malloc()</a>, <a href="#calloc">calloc()</a>,
<a href="#realloc">realloc()</a>的调用返回。例如: <o:p></o:p></span></p>
<pre><span lang=EN-US><span style="mso-spacerun: yes"> </span>typedef struct data_type {<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>int age;<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>char name[20];<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>} data;<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>data *willy;<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>willy = (data*) malloc( sizeof(willy) );<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>...<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>free( willy );<o:p></o:p></span></pre>
<p class=MsoNormal><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="#calloc">calloc()</a>, <a href="#malloc">malloc()</a>, and <a
href="#realloc">realloc()</a>. </strong><o:p></o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span lang=EN-US>
<hr size=2 width="100%" align=center>
</span></div>
<h2><span lang=EN-US><a name="malloc">malloc</a> <o:p></o:p></span></h2>
<p class=MsoNormal><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><span
lang=EN-US> <o:p></o:p></span></p>
<table border=0 cellpadding=0 bgcolor="#ccccff" style='mso-cellspacing:1.5pt;
background:#CCCCFF'>
<tr>
<td style='padding:.75pt .75pt .75pt .75pt'><pre><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>#include <stdlib.h><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>void *malloc( size_t size );<o:p></o:p></span></pre></td>
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</table>
<p><span style='mso-bidi-font-size:10.5pt'>功能： 函数指向一个大小为</span><i><span
lang=EN-US>size</span></i>的空间，如果错误发生返回<span lang=EN-US>NULL。 存储空间的指针必须为堆，不能是栈。这样以便以后用<a
href="#free">free</a>函数释放空间。例如: <o:p></o:p></span></p>
<pre><span lang=EN-US><span style="mso-spacerun: yes"> </span>typedef struct data_type {<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>int age;<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>char name[20];<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>} data;<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>data *bob;<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>bob = (data*) malloc( sizeof(data) );<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>if( bob != NULL ) {<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>bob->age = 22;<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>strcpy( bob->name, "Robert" );<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>printf( "%s is %d years old\n", bob->name, bob->age );<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>}<o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>free( bob );<o:p></o:p></span></pre>
<p class=MsoNormal><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="#free">free()</a>, <a href="#realloc">realloc()</a>, and <a
href="#calloc">calloc()</a>. </strong><o:p></o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span lang=EN-US>
<hr size=2 width="100%" align=center>
</span></div>
<h2><span lang=EN-US><a name="realloc">realloc</a> <o:p></o:p></span></h2>
<p class=MsoNormal><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><span
lang=EN-US> <o:p></o:p></span></p>
<table border=0 cellpadding=0 bgcolor="#ccccff" style='mso-cellspacing:1.5pt;
background:#CCCCFF'>
<tr>
<td style='padding:.75pt .75pt .75pt .75pt'><pre><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>#include <stdlib.h><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>void *realloc( void *ptr, size_t size );<o:p></o:p></span></pre></td>
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</table>
<p><span style='mso-bidi-font-size:10.5pt'>功能： 函数将</span><i><span lang=EN-US>ptr</span></i><span
lang=EN-US> 对象的储存空间改变为给定的大小<i>size</i>。 参数<i>size</i>可以是任意大小，大于或小于原尺寸都可以。 返回值是指向新空间的指针，</span><span
style='mso-bidi-font-size:10.5pt'>如果错误发生返回<span lang=EN-US>NULL。</span></span> <span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><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="#free">free()</a>, <a href="#malloc">malloc()</a>, and <a
href="#calloc">calloc()</a>.</strong></span></p>
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