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标题: 这指令return (abs(a-c)<=abs(b-c) ? a:b);啥意思啊？ [打印本页]
作者: redfox302    时间: 2009-1-10 22:58
标题: 这指令return (abs(a-c)<=abs(b-c) ? a:b);啥意思啊？
<>return (abs(a-c)&lt;=abs(b-c) ? a:b);</P><P>请教高手，这句啥意思？</P><P>谢谢</P>
作者: whut_wj    时间: 2009-1-11 03:34
标题: Re:这指令return (abs(a-c)<=abs(b-c) ? a:b);啥意思啊？
<>1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; abs 是绝对值。</P><P>2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;A&lt;B?a:b&nbsp;&nbsp; //如果A&lt;B结果反回a，如果A<SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">≥B 结果反回b</SPAN></P><P><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">再看不明白找本C的书。</SPAN></P><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-comffice:office" /><o:p><FONT face=宋体></FONT></o:p></SPAN>&nbsp;</P><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt"><o:p><FONT face=宋体></FONT></o:p></SPAN></P>
作者: etch    时间: 2009-1-13 23:09
标题: Re:这指令return (abs(a-c)<=abs(b-c) ? a:b);啥意思啊？
能生成比 if-else精简的分支语句<br>如<br>( a&lt; =b ) ? a:b ;<br>能生成<br>0000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LDD&nbsp;&nbsp; a<br>0003&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CPD&nbsp;&nbsp; b<br>0006&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; BLS&nbsp;&nbsp; *+10 ;abs = 0010//或者BCS *+10或者BCC *+10或者BHI *+10<br>0008&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LDX&nbsp;&nbsp; b<br>000b &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; // &nbsp; <br>000c&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; STX&nbsp;&nbsp; b<br>000f &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; RTS&nbsp; &nbsp;<br>0010&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //<br>0013&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; STD&nbsp;&nbsp; a



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