<div align="right"><font face='宋體' size='2'> 附加說明 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> 使用GCC編譯時請加入-lm。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 范例 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> #include &lt;math.h&gt;<br>
      main()<br>
      {<br>
      int exp;<br>
      double fraction;<br>
      fraction = frexp (1024,&exp);<br>
      printf("exp = %d\n",exp);<br>
      printf("fraction = %f\n", fraction);<br>
      }<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 執(zhí)行 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> exp = 11<br>
      fraction = 0.500000 /* 0.5*(2^11)=1024*/<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top">　 
      <div align="right"><br>
        <font face='宋體' size='2'><a name=linuxc80></a></font> </div>
    </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> <br>
        </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> <br>
      ldexp（計算2的次方值） </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 相關函數(shù) </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> frexp<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 表頭文件 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> #include&lt;math.h&gt;<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 定義函數(shù) </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> double ldexp(double x,int exp);<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 函數(shù)說明 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> ldexp()用來將參數(shù)x乘上2的exp次方值，即x*2exp。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 返回值 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> 返回計算結果。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 附加說明 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> 使用GCC編譯時請加入-lm。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 范例: </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> /* 計算3*(2^2)＝12 */<br>
      #include&lt;math.h&gt;<br>
      main()<br>
      {<br>
      int exp;<br>
      double x,answer;<br>
      answer = ldexp(3,2);<br>
      printf("3*2^(2) = %f\n",answer);<br>
      }<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 執(zhí)行 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> 3*2^(2) = 12.000000<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top">　 
      <div align="right"><br>
        <font face='宋體' size='2'><a name=linuxc81></a></font> </div>
    </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> <br>
        </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> <br>
      log（計算以e 為底的對數(shù)值） </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 相關函數(shù) </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> exp，log10，pow<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 表頭文件 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> #include &lt;math.h&gt;<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 定義函數(shù) </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> double log (double x);<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 函數(shù)說明 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> log（）用來計算以e為底的x 對數(shù)值，然后將結果返回。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 返回值 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> 返回參數(shù)x的自然對數(shù)值。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 錯誤代碼 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> EDOM 參數(shù)x為負數(shù)，ERANGE 參數(shù)x為零值，零的對數(shù)值無定義。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 附加說明 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> 使用GCC編譯時請加入-lm。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 范例 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> #include&lt;math.h&gt;<br>
      main()<br>
      {<br>
      double answer;<br>
      answer = log (100);<br>
      printf("log(100) = %f\n",answer);<br>
      }<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 執(zhí)行 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> log(100) = 4.605170<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top">　 
      <div align="right"><br>
        <font face='宋體' size='2'><a name=linuxc82></a></font> </div>
    </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> <br>
        </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> <br>
      log10（計算以10 為底的對數(shù)值） </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 相關函數(shù) </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> exp，log，pow<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 表頭文件 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> #include&lt;math.h&gt;<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 定義函數(shù) </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> double log10(double x);<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 函數(shù)說明 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> log10()用來計算以10為底的x對數(shù)值，然后將結果返回。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 返回值 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> 返回參數(shù)x以10為底的對數(shù)值。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 錯誤代碼 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> EDOM參數(shù)x為負數(shù)。RANGE參數(shù)x為零值，零的對數(shù)值無定義。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 附加說明 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> 使用GCC編譯時請加入-lm。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 范例 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> #include&lt;math.h&gt;<br>
      main()<br>
      {<br>
      double answer;<br>
      answer = log10(100);<br>
      printf("log10(100) = %f\n",answer);<br>
      }<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 執(zhí)行 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> log10(100) = 2.000000<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top">　 
      <div align="right"><br>
        <font face='宋體' size='2'><a name=linuxc83></a></font> </div>
    </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> <br>
        </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> <br>
      pow（計算次方值） </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 相關函數(shù) </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> exp，log，log10<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 表頭文件 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> #include&lt;math.h&gt;<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 定義函數(shù) </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> double pow(double x,double y);<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 函數(shù)說明 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> pow()用來計算以x為底的y次方值，即xy值，然后將結果返回。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 返回值 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> 返回x的y次方計算結果。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 錯誤代碼 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> EDOM 參數(shù)x為負數(shù)且參數(shù)y不是整數(shù)。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 附加說明 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> 使用GCC編譯時請加入-lm。<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 范例 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> #include &lt;math.h&gt;<br>
      main()<br>
      {<br>
      double answer;<br>
      answer =pow(2,10);<br>
      printf("2^10 = %f\n", answer);<br>
      }<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 執(zhí)行 </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> 2^10 = 1024.000000<br>
      </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top">　 
      <div align="right"><br>
        <font face='宋體' size='2'><a name=linuxc84></a></font> </div>
    </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> <br>
        </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> <br>
      sin（取正玄函數(shù)值） </font> </td>
  </tr>
  <tr> 
    <td width="80" valign="top"> 
      <div align="right"><font face='宋體' size='2'> 相關函數(shù) </font> </div>
    </td>
    <td valign="top"> <font face='宋體' size='2'> acos，asin，atan，atan2，cos，tan<br>
      </font> </td>