<p><br></p><pre style="max-width: 100%;"><code class="cpp hljs" codemark="1"><span class="hljs-meta">#<span class="hljs-meta-keyword">include</span></span> <span class="hljs-meta">#<span class="hljs-meta-keyword">include</span></span> <span class="hljs-keyword">typedef</span> <span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> u16; <span class="hljs-keyword">typedef</span> <span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">char</span> u8; <span class="hljs-meta">#<span class="hljs-meta-keyword">define</span> LED P2</span> u16 i; <span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">Tmier</span><span class="hljs-params">()</span> </span>{ TMOD |=<span class="hljs-number">0X01</span>; TH0=<span class="hljs-number">0XD8</span>; TL0=<span class="hljs-number">0XF0</span>; ET0=<span class="hljs-number">1</span>; TR0=<span class="hljs-number">1</span>; EA=<span class="hljs-number">1</span>; } <span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">()</span> </span>{ Tmier(); led=<span class="hljs-number">0xfe</span>; <span class="hljs-keyword">while</span>(<span class="hljs-number">1</span>) { led=<span class="hljs-number">0xfe</span>; IF(i==<span class="hljs-number">10</span>) { i=<span class="hljs-number">0</span>; led=_cror_(led,<span class="hljs-number">1</span>); } } } <span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">Into</span> <span class="hljs-params">()</span> interrupt 1 </span>{ TH0=<span class="hljs-number">0XD8</span>; TL0=<span class="hljs-number">0XF0</span>; i++; }</code></pre> <font face="微软雅黑"><font style="font-size:18px">这样写为啥不行，而把led再定义之后就可以了呢？如在主函数中再加一句unsigned char data1=led;然后把后面的led换成data1流水灯就好了呢？为啥？</font></font><br> <p><br></p>