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<div id="News_title"><h1>编译原理课后习题答案_精品资料－第六章</h1></div>
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<div id="News_info"><ul><li>作者：本站 来源：本站原创 发布时间：2007-12-25 18:42:57</li></ul></div>
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<P class=MsoNormal style="TEXT-INDENT: 21pt; LINE-HEIGHT: 16pt; TEXT-ALIGN: center; mso-line-height-rule: exactly; tab-stops: 49.5pt" align=center><B style="mso-bidi-font-weight: normal">第六章 属性文法和语法制导翻译
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<P class=MsoNormal style="TEXT-INDENT: 21pt; LINE-HEIGHT: 16pt; mso-line-height-rule: exactly; tab-stops: 49.5pt">7.下列文法由开始符号S产生一个二进制数,令综合属性val给出该数的值:
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<P class=MsoNormal style="TEXT-INDENT: 21pt; LINE-HEIGHT: 16pt; mso-line-height-rule: exactly; tab-stops: 49.5pt"> S→L.L|L
<p>
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<P class=MsoNormal style="TEXT-INDENT: 21pt; LINE-HEIGHT: 16pt; mso-line-height-rule: exactly; tab-stops: 49.5pt"> L→LB|B
<p>
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<P class=MsoNormal style="TEXT-INDENT: 21pt; LINE-HEIGHT: 16pt; mso-line-height-rule: exactly; tab-stops: 49.5pt"> B→0|1
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<P class=MsoNormal style="TEXT-INDENT: 21pt; LINE-HEIGHT: 16pt; mso-line-height-rule: exactly; tab-stops: 49.5pt">试设计求S.val的属性文法,其中,已知B的综合属性c,给出由B产生的二进位的结果值。例如
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<P class=MsoNormal style="TEXT-INDENT: 21pt; LINE-HEIGHT: 16pt; mso-line-height-rule: exactly; tab-stops: 49.5pt">，输入101.101时, S.val=5.625,其中,第一个二进位的值是4,最后一个二进位的值是0. 125。
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<P class=MsoNormal style="TEXT-INDENT: 21pt; LINE-HEIGHT: 16pt; mso-line-height-rule: exactly; tab-stops: 49.5pt">解答：
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<P class=MsoNormal style="TEXT-INDENT: 21pt; LINE-HEIGHT: 16pt; mso-line-height-rule: exactly; tab-stops: 49.5pt">对于101.101的语法树为：
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<P class=MsoNormal style="TEXT-INDENT: 189pt; mso-char-indent-count: 18.0"><v:group id=_x0000_s1026 style="MARGIN-TOP: 19.5pt; Z-INDEX: 1; LEFT: 0px; MARGIN-LEFT: 160pt; WIDTH: 56pt; POSITION: absolute; HEIGHT: 27pt; TEXT-ALIGN: left" coordsize="1120,434" coordorigin="4197,2746"><v:line id=_x0000_s1027 style="POSITION: absolute" to="4838,3180" from="4837,2746"></v:line><v:line id=_x0000_s1028 style="POSITION: absolute; flip: x" to="4677,3180" from="4197,2746"></v:line><v:line id=_x0000_s1029 style="POSITION: absolute" to="5317,3180" from="4998,2746"></v:line></v:group>S </P>
<P class=MsoNormal> </P>
<P class=MsoNormal><v:group id=_x0000_s1033 style="MARGIN-TOP: 18.25pt; Z-INDEX: 3; LEFT: 0px; MARGIN-LEFT: 196pt; WIDTH: 42.5pt; POSITION: absolute; HEIGHT: 27pt; TEXT-ALIGN: left" coordsize="850,540" coordorigin="2084,5190"><v:line id=_x0000_s1034 style="POSITION: absolute; flip: x" to="2564,5730" from="2084,5190"></v:line><v:line id=_x0000_s1035 style="POSITION: absolute" to="2934,5730" from="2615,5190"></v:line></v:group><v:group id=_x0000_s1030 style="MARGIN-TOP: 19pt; Z-INDEX: 2; LEFT: 0px; MARGIN-LEFT: 137.5pt; WIDTH: 42.5pt; POSITION: absolute; HEIGHT: 27pt; TEXT-ALIGN: left" coordsize="850,540" coordorigin="2084,5190"><v:line id=_x0000_s1031 style="POSITION: absolute; flip: x" to="2564,5730" from="2084,5190"></v:line><v:line id=_x0000_s1032 style="POSITION: absolute" to="2934,5730" from="2615,5190"></v:line></v:group> L <B style="mso-bidi-font-weight: normal">.</B> L1 </P>
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<P class=MsoNormal><v:group id=_x0000_s1036 style="MARGIN-TOP: 15.25pt; Z-INDEX: 4; LEFT: 0px; MARGIN-LEFT: 109.5pt; WIDTH: 42.5pt; POSITION: absolute; HEIGHT: 30.75pt; TEXT-ALIGN: left" coordsize="850,540" coordorigin="2084,5190"><v:line id=_x0000_s1037 style="POSITION: absolute; flip: x" to="2564,5730" from="2084,5190"></v:line><v:line id=_x0000_s1038 style="POSITION: absolute" to="2934,5730" from="2615,5190"></v:line></v:group><v:line id=_x0000_s1044 style="Z-INDEX: 8; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left" to="178pt,46pt" from="177.5pt,17.5pt"></v:line><v:group id=_x0000_s1039 style="MARGIN-TOP: 16.75pt; Z-INDEX: 5; LEFT: 0px; MARGIN-LEFT: 183.75pt; WIDTH: 28.5pt; POSITION: absolute; HEIGHT: 30pt; TEXT-ALIGN: left" coordsize="570,600" coordorigin="3054,6075"><v:line id=_x0000_s1040 style="POSITION: absolute; flip: x" to="3254,6675" from="3054,6090"></v:line><v:line id=_x0000_s1041 style="POSITION: absolute" to="3624,6615" from="3305,6075"></v:line></v:group><v:line id=_x0000_s1049 style="Z-INDEX: 13; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left" to="240pt,44.5pt" from="239.5pt,16pt"></v:line> L B L B</P>
<P class=MsoNormal>
<p>
<P class=MsoNormal><v:line id=_x0000_s1043 style="Z-INDEX: 7; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left" to="153.5pt,46.75pt" from="153pt,18.25pt"></v:line><v:line id=_x0000_s1048 style="Z-INDEX: 12; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left" to="109.75pt,46.75pt" from="109.25pt,18.25pt"></v:line><v:line id=_x0000_s1042 style="Z-INDEX: 6; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left" to="188.25pt,46.75pt" from="187.75pt,18.25pt"></v:line><v:line id=_x0000_s1045 style="Z-INDEX: 9; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left" to="3in,45.25pt" from="215.5pt,16.75pt"></v:line> L B 1 L B 1</P>
<P class=MsoNormal>
<p>
<P class=MsoNormal><v:line id=_x0000_s1046 style="Z-INDEX: 10; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left" to="110.5pt,46pt" from="110pt,17.5pt"></v:line><v:line id=_x0000_s1047 style="Z-INDEX: 11; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left" to="189.75pt,43.75pt" from="189.25pt,15.25pt"></v:line> B 0 B 0</P>
<P class=MsoNormal>
<p>
<P class=MsoNormal> 1 1</P>
<P class=MsoNormal>假设一个二进制数为： a<SUB>m</SUB>….a<SUB>1</SUB>a<SUB>0</SUB>.b<SUB>n</SUB>...b<SUB>1</SUB>b<B style="mso-bidi-font-weight: normal"><SUB>0</SUB></B></P>
<P class=MsoNormal>其中，a<SUB>i</SUB>(i=0，1，…，m)和bj(j=0,1,…,n)为二进制数字，则该二进制数的十进制数为：</P>
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