编译原理课后答案(陈火旺)

第二章P36-6(1)L G ()1是0~9组成的数字串(2)最左推导:N ND NDD NDDD DDDD DDD DD D N ND DD D N ND NDD DDD DD D ⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒0010120127334556568最右推导:N ND N ND N ND N D N ND N D N ND N ND N D ⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒77272712712701274434886868568P36-7G(S)O N O D N S O AO A AD N→→→→→1357924680|||||||||||P36-8文法：E T E T E T TF T F T F F E i→+-→→|||*|/()| 最左推导:E E T T TF T i T i T F i F F i i F i i i E T T F F F i F i E i E T i T T i F T i i T i i F i i i ⇒+⇒+⇒+⇒+⇒+⇒+⇒+⇒+⇒⇒⇒⇒⇒⇒+⇒+⇒+⇒+⇒+⇒+********()*()*()*()*()*()*()最右推导:E E T E TF E T i E F i E i i T i i F i i i i i E T F T F F F E F E T F E F F E i F T i F F i F i i i i i ⇒+⇒+⇒+⇒+⇒+⇒+⇒+⇒+⇒⇒⇒⇒⇒+⇒+⇒+⇒+⇒+⇒+⇒+**********()*()*()*()*()*()*()*()语法树：/********************************EE FTE +T F F T +iiiEEFTE-T F F T -iiiE EFT+T F FTiii*i+i+ii-i-ii+i*i*****************/P36-9句子iiiei 有两个语法树：S iSeS iSei iiSei iiiei S iS iiSeS iiSei iiiei ⇒⇒⇒⇒⇒⇒⇒⇒P36-10/**************)(|)(|S T TTS S →→***************/P36-11/*************** L1:ε||cC C ab aAb A AC S →→→ L2:bcbBc B aA A AB S ||→→→εL3:εε||aBb B aAb A AB S →→→ L4:AB B A A B A S |01|10|→→→ε ***************/第三章习题参考答案P64–7(1)101101(|)*1 ε ε 1 0 1 1确定化：0 1 {X} φ {1,2,3} φ φ φ {1,2,3} {2,3} {2,3,4} {2,3} {2,3} {2,3,4} {2,3,4} {2,3,5} {2,3,4}{2,3,5} {2,3} {2,3,4,Y} {2,3,4,Y}{2,3,5}{2,3,4,}1 00 0 1 1 00 1 0 1 1 1 最小化：X 1 2 3 4 Y5 XY60 12 35 4{,,,,,},{}{,,,,,}{,,}{,,,,,}{,,,}{,,,,},{},{}{,,,,}{,,}{,,,},{},{},{}{,,,}{,01234560123451350123451246012345601234135012345601231010==== 3012312401234560110112233234012345610101}{,,,}{,,}{,},{,}{},{},{}{,}{}{,}{,}{,}{}{,}{}{},{},{,},{},{},{}===== 0 10 0 1 00 1 0 1 1 1P64–8(1)01)0|1(*(2))5|0(|)5|0()9|8|7|6|5|4|3|2|1|0)(9|8|7|6|5|4|3|2|1(*(3)******)110|0(01|)110|0(10P64–12(a)a,b a a b {0} {0,1} {1} {0,1} {0,1} {1} {1} {0} φ φφφ给状态编号：a b 0125 01 2 4 3 011 12 2 03 333aaa b b bba 最小化：{,},{,}{,}{}{,}{}{,}{,}{,}{}{,},{},{}012301101223032330123a ba b ====b bab (b)b b aa baa bb aa a 已经确定化了,进行最小化 最小化：{{,}, {,,,}}012345011012423451305234523452410243535353524012435011012424{,}{}{,}{,}{,,,}{,,,}{,,,}{,,,}{,}{,}{,}{,}{,}{,}{,}{,}{{,},{,},{,}}{,}{}{,}{,}{,}a b a b a b a b a b a =============={,}{,}{,}{,}{,}{,}{,}10243535353524 b a b0 1 2 3 01 2 0 2 3 14 5b b aa baP64–14(1) 01 0 (2):(|)*0100 1 ε ε0 确定化：0 1 {X,1,Y} {1,Y} {2} {1,Y} {1,Y} {2} {2} {1,Y} φ φφφ 0 1 0 1 2 1 1 2 2 1 3 33 30 1 01 1 10 最小化：0 1 2 01YX YX2 1 0 2 13{,},{,}{,}{}{,}{}{,}{,}{,}{}{,},{},{}0123011012231323301230101====1 1 1 0第四章P81–1(1) 按照T,S 的顺序消除左递归ε|,)(||^)(T S T T S T T a S S G '→''→→'递归子程序： procedure S; beginif sym='a' or sym='^' then abvance else if sym='(' then begin advance;T;if sym=')' then advance; else error; end else error end;procedure T; begin S;'T end;procedure 'T ; beginif sym=',' then begin advance; S;'T end1 3其中:sym:是输入串指针IP 所指的符号 advance:是把IP 调至下一个输入符号 error:是出错诊察程序 (2)FIRST(S)={a,^,(} FIRST(T)={a,^,(} FIRST('T )={,,ε} FOLLOW(S)={),,,#} FOLLOW(T)={)} FOLLOW('T )={)} 预测分析表a^() , # S S a →S →^S T →()TT ST →' T ST →' T ST →''T'→T ε '→'T ST ,是LL(1)文法P81–2文法：|^||)(|*||b a E P F F F P F T T T F T E E E T E →'→''→→''→+→''→εεε(1)FIRST(E)={(,a,b,^} FIRST(E')={+,ε} FIRST(T)={(,a,b,^} FIRST(T')={(,a,b,^,ε} FIRST(F)={(,a,b,^} FIRST(F')={*,ε} FIRST(P)={(,a,b,^} FOLLOW(E)={#,)} FOLLOW(E')={#,)} FOLLOW(T)={+,),#} FOLLOW(T')={+,),#}FOLLOW(F)={(,a,b,^,+,),#} FOLLOW(F')={(,a,b,^,+,),#} FOLLOW(P)={*,(,a,b,^,+,),#}考虑下列产生式:'→+'→'→'→E E T T F F P E a b ||*|()|^||εεεFIRST(+E)∩FIRST(ε)={+}∩{ε}=φ FIRST(+E)∩FOLLOW(E')={+}∩{#,)}=φ FIRST(T)∩FIRST(ε)={(,a,b,^}∩{ε}=φ FIRST(T)∩FOLLOW(T')={(,a,b,^}∩{+,),#}=φ FIRST(*F')∩FIRST(ε)={*}∩{ε}=φFIRST(*F')∩FOLLOW(F')={*}∩{(,a,b,^,+,),#}=φ FIRST((E))∩FIRST(a) ∩FIRST(b) ∩FIRST(^)=φ 所以,该文法式LL(1)文法. (3)+ * ( ) a b ^ # EE TE →'E TE →' E TE →' E TE →'E' '→+E E'→E ε'→E εTT F T →' T F T →' T F T →' T F T →' T' '→T ε'→T T '→T ε '→T T '→T T '→T T '→T εFF P F →'F P F →' F P F →' F P F →'F' '→F ε '→'F F * '→F ε '→F ε '→F ε '→F ε '→F ε '→F εPP E →() P a → P b → P →^(4)procedure E; beginif sym='(' or sym='a' or sym='b' or sym='^' then begin T; E' end else error endprocedure E'; beginif sym='+'then begin advance; E endelse if sym<>')' and sym<>'#' then error endprocedure T; beginif sym='(' or sym='a' or sym='b' or sym='^' then begin F; T' end else error endprocedure T';if sym='(' or sym='a' or sym='b' or sym='^' then Telse if sym='*' then errorendprocedure F;beginif sym='(' or sym='a' or sym='b' or sym='^' then begin P; F' endelse errorendprocedure F';beginif sym='*'then begin advance; F' endendprocedure P;beginif sym='a' or sym='b' or sym='^'then advanceelse if sym='(' thenbeginadvance; E;if sym=')' then advanceelse errorendelse errorend;P81–3/***************(1)是，满足三个条件。