【单选题】
函数<img src=https://huaweicloudobs.ahjxjy.cn/1B7AA3FBC42E1DB51F2338D30DDF2F35.png title=])FN$0G%CZ%C_U)XYE2`S81.png alt=])FN$0G%CZ%C_U)XYE2`S81.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/29754C24B437FA364ECC66DE92566489.png title=999%N_2(M@OY)81A_SZ~$MN.png alt=999%N_2(M@OY)81A_SZ~$MN.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/4423C5A411EF860433B91B79BAFAB34F.png title=LMK65`3PT$L6PCA)4PW%]`4.png alt=LMK65`3PT$L6PCA)4PW%]`4.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/830241F8FB4A66A92423857B3B538A5F.png title=S6`7{E(DG_I55H@V$PBG$AG.png alt=S6`7{E(DG_I55H@V$PBG$AG.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/F3E92BC71F1FA59E4D00EB25D36AFD86.png title=Y[%87U3]CM20TA5$69JR70B.png alt=Y[%87U3]CM20TA5$69JR70B.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/2971277726E1AB4C1E94594D5B2FE1D0.png title=1.png alt=1.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/E4AFF8B95AFC07CFEC2088188963B66F.png title=1-1.png alt=1-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/14D6A6620C61E782D83BD285E941A010.png title=1-2.png alt=1-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/A23DE06F7045AA7BC582D44A2732334B.png title=1-3.png alt=1-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/D67541B9BE2CDB0204F01B82B28FBEE7.png title=1-4.png alt=1-4.png/>
【简答题】
已知赋值语句a:=b*(-c)+b*(-c)和产生赋值语句的抽象语法树的属性文法如下表1所示,请写出该赋值语句的抽象语法树、DAG图。表1 产生赋值语句抽象语法树的属性文法产 生 式语义规则S→id:=ES.nptr:=mknode(‘assign’,mkleaf(id,id.place),E.nptr)E→E1+E2E.nptr:=mknode(‘+’,E1.nptr,E2.nptr)E→E1*E2E.nptr:=mknode(‘*’,E1.nptr,E2.nptr)E→-E1E.nptr:=mknode(‘*’,E1.nptr,E2.nptr)E→ (E1)E.nptr:=E1.nptrE→idE.nptr:=mkleaf(id,id.place)
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/1DEB1D1E04E22E79326371436CD6FFD9.jpg title=16-B.jpg alt=16-B.jpg/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/F57765DA9E4F906640157816E9066C00.jpg title=16-1.jpg alt=16-1.jpg/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/5BF125997885CE76CDF752EAEE1BDC9A.jpg title=16-2.jpg alt=16-2.jpg/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/5E5AC54C2D53F07F029ABB87E18A7749.jpg title=16-3.jpg alt=16-3.jpg/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/A841D6F7DB2B2E091ACA04C1F86E99A1.jpg title=16-4.jpg alt=16-4.jpg/>