the04.htm

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                      B'&lt;二进制数字&gt;'</p></td>
                  <td width="174" valign="top" > <p class="lh15" >&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
                      B'00111001'</p></td>
                </tr>
                <tr> 
                  <td width="133" valign="top" > <p class="lh15" >八进制</p></td>
                  <td width="301" valign="top" > <p class="lh15" >&nbsp;&nbsp;&nbsp;&nbsp; 
                      O'&lt;八进制数字&gt;'</p></td>
                  <td width="174" valign="top" > <p class="lh15" >&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
                      O'777'</p></td>
                </tr>
                <tr> 
                  <td width="133" valign="top" > <p class="lh15" >字符ASCⅡ码</p></td>
                  <td width="301" valign="top" > <p class="lh15" >&nbsp;&nbsp;&nbsp;&nbsp; 
                      '&lt; 字 符 &gt;'</p></td>
                  <td width="174" valign="top" > <p class="lh15" >&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
                      'C'</p></td>
                </tr>
              </table>
            </div>
            <p class="lh15" >&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 注：MPASM默认进制为16进制。</p>
            <div align="center"><span class="lh15">表4.1 </span> </div>
            <p   class="lh15">（3）表达式——由常数、符号和各种算术运算符号按一定顺序组成。</p>
            <p   class="lh15">MPASM中的算术符号如表4.2所示。</p>
            <div align="center"> 
              <table border="1" cellspacing="0" cellpadding="0" >
                <tr> 
                  <td width="224" colspan="2" class="lh15" > 运&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
                    算&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 符 </td>
                  <td width="196" class="lh15" > 例&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
                    子 </td>
                </tr>
                <tr> 
                  <td width="72" > <p class="lh15" >&nbsp; （</p></td>
                  <td width="152" class="lh15" > 左括号 </td>
                  <td width="196" class="lh15" > 1+（d*4） </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > ） </td>
                  <td width="152" class="lh15" > 右括号 </td>
                  <td width="196" class="lh15" > 同上 </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > ! </td>
                  <td width="152" class="lh15" > 非 </td>
                  <td width="196" class="lh15" > IF !(a-b) </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > + </td>
                  <td width="152" class="lh15" > 加 </td>
                  <td width="196" class="lh15" > a+b </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > - </td>
                  <td width="152" class="lh15" > 减 </td>
                  <td width="196" class="lh15" > a-b </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > * </td>
                  <td width="152" class="lh15" > 乘 </td>
                  <td width="196" class="lh15" > a*b </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > / </td>
                  <td width="152" class="lh15" > 除 </td>
                  <td width="196" class="lh15" > a/b </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > % </td>
                  <td width="152" class="lh15" > 取模 </td>
                  <td width="196" class="lh15" > a%2 </td>
                </tr>
                <tr> 
                  <td width="72" > <span class="lh15">&lt;&lt; </span></td>
                  <td width="152" class="lh15" > 左移 </td>
                  <td width="196" > <span class="lh15">&lt;&lt;a </span></td>
                </tr>
                <tr> 
                  <td width="72" > <span class="lh15">&gt;&gt; </span></td>
                  <td width="152" class="lh15" > 右移 </td>
                  <td width="196" > <span class="lh15">&gt;&gt;a </span></td>
                </tr>
                <tr> 
                  <td width="72" > <span class="lh15">&gt; </span></td>
                  <td width="152" class="lh15" > 大于 </td>
                  <td width="196" class="lh15" > IF a&gt;b </td>
                </tr>
                <tr> 
                  <td width="72" > <span class="lh15">&lt; </span></td>
                  <td width="152" class="lh15" > 小于 </td>
                  <td width="196" class="lh15" > IF a&lt;b </td>
                </tr>
                <tr> 
                  <td width="72" > <span class="lh15">&lt;= </span></td>
                  <td width="152" class="lh15" > 小于或等于 </td>
                  <td width="196" class="lh15" > IF a&lt;=b </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > == </td>
                  <td width="152" class="lh15" > 等于 </td>
                  <td width="196" class="lh15" > IF a==b </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > != </td>
                  <td width="152" class="lh15" > 不等于 </td>
                  <td width="196" class="lh15" > IF a!=b </td>
                </tr>
                <tr> 
                  <td width="72" > <span class="lh15">&amp; </span></td>
                  <td width="152" class="lh15" > 与 </td>
                  <td width="196" class="lh15" > a &amp; b </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > ^ </td>
                  <td width="152" class="lh15" > 异或 </td>
                  <td width="196" class="lh15" > a ^ b </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > │ </td>
                  <td width="152" class="lh15" > 或 </td>
                  <td width="196" class="lh15" > a │ b </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > ～ </td>
                  <td width="152" class="lh15" > 取反 </td>
                  <td width="196" >&nbsp; </td>
                </tr>
                <tr> 
                  <td width="72" > <span class="lh15">&amp; &amp; </span></td>
                  <td width="152" class="lh15" > 逻辑与 </td>
                  <td width="196" class="lh15" > IF (a=2) &amp;&amp; (b=3) </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > ││ </td>
                  <td width="152" class="lh15" > 逻辑或 </td>
                  <td width="196" class="lh15" > IF (a=2) ││(b=3) </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > = </td>
                  <td width="152" class="lh15" > 等于 </td>
                  <td width="196" class="lh15" > a=b </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > += </td>
                  <td width="152" class="lh15" > 加，然后等于 </td>
                  <td width="196" class="lh15" > a+=1 </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > -= </td>
                  <td width="152" class="lh15" > 减，然后等于 </td>
                  <td width="196" class="lh15" > a-=1 </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > *= </td>
                  <td width="152" class="lh15" > 乘，然后等于 </td>
                  <td width="196" class="lh15" > a*=5 </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > /= </td>
                  <td width="152" class="lh15" > 除，然后等于 </td>
                  <td width="196" class="lh15" > a/=5 </td>
                </tr>
                <tr> 
                  <td width="72" > <span class="lh15">&lt;&lt;= </span></td>
                  <td width="152" class="lh15" > 左移，然后等于 </td>
                  <td width="196" class="lh15" > a&lt;&lt;=5 </td>
                </tr>
                <tr> 
                  <td width="72" > <span class="lh15">&gt;&gt;= </span></td>
                  <td width="152" class="lh15" > 右移，然后等于 </td>
                  <td width="196" class="lh15" > a&gt;&gt;=5 </td>
                </tr>
                <tr> 
                  <td width="72" > <span class="lh15">&amp;= </span></td>
                  <td width="152" class="lh15" > 与，然后等于 </td>
                  <td width="196" class="lh15" > a&amp;=5 </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > │= </td>
                  <td width="152" class="lh15" > 或，然后等于 </td>
                  <td width="196" class="lh15" > a│=5 </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > ^= </td>
                  <td width="152" class="lh15" > 异或，然后等于 </td>
                  <td width="196" class="lh15" > a^=5 </td>
                </tr>
                <tr> 
                  <td width="72" class="lh15" > ￥ </td>
                  <td width="152" class="lh15" > 返回当前PC值 </td>
                  <td width="196" class="lh15" > GOTO ￥+3 </td>
                </tr>