📄 深入理解sizeof.htm

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<body lang=ZH-CN style='tab-interval:21.0pt'>

<div class=Section1>

<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>

<p class=MsoNormal><span lang=EN-US>http://www.insun.hit.edu.cn/oblog3/user1/13/archives/2005/103.asp&nbsp;</span></p>

</blockquote>

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  <td style='padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal>深入理解<span lang=EN-US>sizeof</span>（转载） </p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:1;mso-yfti-lastrow:yes'>
  <td style='padding:0cm 0cm 0cm 0cm'>
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    <td style='padding:0cm 0cm 0cm 0cm'>
    <p class=MsoNormal>辉<span lang=EN-US>-&gt;</span>春去春来 发表于<span lang=EN-US>
    2005-7-9 20:49:05 </span></p>
    </td>
   </tr>
  </table>
  <p class=MsoNormal><span lang=EN-US><o:p>&nbsp;</o:p></span></p>
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    <td style='padding:0cm 0cm 0cm 0cm'>
    <p>最近在论坛里总有人问关于<span lang=EN-US>sizeof</span>的问题，并且本人对这个问题 </p>
    <p>也一直没有得到很好的解决，索性今天对它来个较为详细的总结，同 </p>
    <p>时结合<span lang=EN-US>strlen</span>进行比较，如果能对大家有点点帮助，这是我最大的欣 </p>
    <p>慰了。 </p>
    <p>　　一、好首先看看<span lang=EN-US>sizeof</span>和<span lang=EN-US>strlen</span>在<span
    lang=EN-US>MSDN</span>上的定义： </p>
    <p>　　首先看一<span lang=EN-US>MSDN</span>上如何对<span lang=EN-US>sizeof</span>进行定义的：
    </p>
    <p>　　<span lang=EN-US>sizeof Operator </span></p>
    <p>　　<span lang=EN-US>sizeof expression </span></p>
    <p>　　<span lang=EN-US>The sizeof keyword gives the amount of storage, in
    bytes, </span></p>
    <p><span lang=EN-US>associated with a variable or a type (including
    aggregate types). </span></p>
    <p><span lang=EN-US>This keyword returns a value of type size_t. </span></p>
    <p>　　<span lang=EN-US>The expression is either an identifier or a type-cast
    expression </span></p>
    <p><span lang=EN-US>(a type specifier enclosed in parentheses). </span></p>
    <p>　　<span lang=EN-US>When applied to a structure type or variable, sizeof
    returns </span></p>
    <p><span lang=EN-US>the actual size, which may include padding bytes
    inserted for </span></p>
    <p><span lang=EN-US>alignment. When applied to a statically dimensioned
    array, sizeof </span></p>
    <p><span lang=EN-US>returns the size of the entire array. The sizeof
    operator cannot </span></p>
    <p><span lang=EN-US>return the size of dynamically allocated arrays or
    external </span></p>
    <p><span lang=EN-US>arrays. </span></p>
    <p>　　然后再看一下对<span lang=EN-US>strlen</span>是如何定义的： </p>
    <p>　　<span lang=EN-US>strlen </span></p>
    <p>　　<span lang=EN-US>Get the length of a string. </span></p>
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