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<a href="/html/sitemap.html">HTML</a> | <a href="/sitemap.txt">TXT</a></span></div> <div class="bank"> <div class="logo"> <h1><strong><a href="http://www.themmauniversity.com" style="margin-right:10px">南软g开?/a></strong><strong><a href="http://www.themmauniversity.com">׃软g开?/a></strong></h1> </div> <div class="contact-top"></div> </div> <div class="menu"> <ul> <li><a href="/">?#160;   ?/a></li> <li><a href="/About/">关于我们</a></li> <li><a href="/Advantage/">开发优?/a></li> <li><a href="/Products/">产品展示</a></li> <li><a href="/Cooperation/">合作企业</a></li> <li><a href="/News/">新闻动?/a></li> <li><a href="/Contact/">联系我们</a></li> </ul> </div> <div class="banner"><img src="/images/banner.jpg" width="1000" height="341"/></div> </div> <div id="position"><div>您当前位|:<a href="/">软g开?/a> >> <a href="/News/">新闻动?/a> >> <a href="/News/Technology/">软g开发技?/a> >> 览文章</div></div> <div class="youshi_f1" id="youshi_tdyx"> <div class="youshi01"> <h1 class="article_title">c中malloc和memset在多l数l上的应?/h1> <div class="article_author">d旉Q?016-9-27 15:42:00 文章作者:<a href="/">南软g开?/a> 览ơ数Q?Script Language="Javascript" Src="/item/GetHits.asp?Action=Count&GetFlag=0&m=1&ID=2797"></Script></div> <div class="article_main"><div id="MyContent"><p><span style="font-size: 14px;">  <a href="/" target="_self"><strong>׃软g开?/strong></a>认ؓQ两者都是对内存q行操作的函数。应用在多维数组上时Q需特别注意一下?/span></p><p><span style="font-size: 14px;">  首先看看两者原型?/span></p><p><span style="font-size: 14px;">  1.malloc函数Q用于从堆上分配指定字节的内存空间?/span></p><p><span style="font-size: 14px;">  void * malloc(size_t n);</span></p><p><span style="font-size: 14px;">  n求分配的内存字节数。如果执行成功,函数q回获得的内存空间的首地址Q执行失败,q回gؓNULL?/span></p><p><span style="font-size: 14px;">  ׃函数q回值值的cd为void的指针,因此Q可以将void指针cd转换后赋值给Lcd指针Q这样就可以通过操作该类型指针来操作从堆上获得的内存I间?/span></p><p><span style="font-size: 14px;">  malloc函数分配得到的内存空间是未初始化的。有时候,在用前需要对该内存空间进行初始化Q此时用上memset?/span></p><p><span style="font-size: 14px;">  2.memset函数</span></p><p><span style="font-size: 14px;">  void * memset (void * p,int c,size_t n);</span></p><p><span style="font-size: 14px;">  指针p为所操作的内存空间的首地址Qc为每个字节所赋的|n为所操作内存I间的字节长度,也就是内存被赋gؓc的字节数?/span></p><p><span style="font-size: 14px;">  注意的它是以字节为单位进行赋值的Q赋D围是0x00?xFF?/span></p><p><span style="font-size: 14px;">  在多l数l上的应用。如二维?/span></p><p><span style="font-size: 14px;">  double **weight; //二维数组weight[n][m]</span></p><p><span style="font-size: 14px;">  weight=(double**)malloc(n*sizeof(double*)); //注意是sizeof里头是double*而不是double。该l装的是指针</span></p><p><span style="font-size: 14px;">  int i=0;</span></p><p><span style="font-size: 14px;">  for(;i<n;i++){</span></p><p><span style="font-size: 14px;">  weight[i]=(double*)malloc(n*sizeof(double));</span></p><p><span style="font-size: 14px;">  memset(weight[i],0,n*sizeof(double));  //正确。注意是对weight[i]Q而不是weight</span></p><p><span style="font-size: 14px;">  }</span></p><p><span style="font-size: 14px;">  //memset(weight,0,sizeof(n*n*sizeof(double));</span></p><p><span style="font-size: 14px;">  //q样的统一Ҏ个二l数l初始化是错误的Q因二维数组是通过分次malloc得到的,各内存不一定连l?/span></p><p><span style="font-size: 14px;">  //但如果是直接声明的多l数l如a[5][5]Q其内存肯定是连l的Q此时统一memset没问题?/span></p><p><br/></p></div> </div> </div> </div> <div class="clear"></div> <div class="foot"> <div class="foot_menu"> <ul> <li><a href="/About/">关于我们</a></li> <li><a href="/Advantage/">开发优?/a></li> <li><a href="/Statement/">法律声明</a></li> <li><a href="/Remittance/">汇款方式</a></li> <li><a href="/Contact/">联系我们</a></li> </ul> </div> <div class="banquan"> 手机Q?8678812288 EQMail:1069706080@qq.com<br /> 地址Q山东省南市舜耕\泉城公园东门园内向北50c? 鲁ICP?7011972? 版权所?008Q?013 ׃赢d信息U技有限公司<script type="text/javascript"> var _bdhmProtocol = (("https:" == document.location.protocol) ? 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