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语法分析报告

《编译原理》课程

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实验2：语法分析

大学英语语法--被动态-练习题

练习题 1) It is said that a new robot ____by him in a few days. A) designed B) has been designed C) will be designed D) will have been designed 2)We are late. I expect the film ____by the time we get to the cinema. A) will already have started B) would already have started C) shall have already started D) has already been started 3) She will stop showing off if no notice____ of her. A) is taken B) takes C) will be taken D) has taken 4) Diamond ____in Brazil in 1971. A) is found B) has been found

C) was found D) had been found 5)“Have you moved into the new flat?” Not yet. The room____.” A) has been painted B) is painted C) paints D) is being painted 6) My pictures ____until next Friday. A) won't develop B) aren't developed C) don't develop D) won' t be developed 7) Tim ____since he lost his job three weeks ago. A) had been unemployed B) was unemployed C) has been unemployed D) has unemployed 8) A great number of colleges and universities ____since 1949. A) has been establish B) have been established C) have established D) had been established

编译原理实验报告《LL(1)语法分析器构造》

《LL（1）分析器的构造》实验报告一、实验名称 LL(1)分析器的构造二、实验目的设计、编制、调试一个LL(1)语法分析器，利用语法分析器对符号串的识别，加深对语法分析原理的理解。三、实验内容和要求设计并实现一个LL(1)语法分析器，实现对算术文法: G[E]:E->E+T|T T->T*F|F F->(E)|i 所定义的符号串进行识别，例如符号串i+i*i为文法所定义的句子，符号串ii+++*i+不是文法所定义的句子。实验要求: 1、检测左递归，如果有则进行消除； 2、求解FIRST集和FOLLOW集； 3、构建LL(1)分析表； 4、构建LL分析程序，对于用户输入的句子，能够利用所构造的分析程序进行分析，并显示出分析过程。四、主要仪器设备硬件：微型计算机。软件： Code blocks（也可以是其它集成开发环境）。五、实验过程描述 1、程序主要框架程序中编写了以下函数，各个函数实现的作用如下： void input_grammer(string *G);//输入文法G

//将文法G预处理得到产生式集合P，非终结符、终结符集合U、u， int eliminate_1(string *G,string *P,string U,string *GG);//消除文法G中所有直接左递归得到文法GG int* ifempty(string* P,string U,int k,int n);//判断各非终结符是否能推导为空 string* FIRST_X(string* P,string U,string u,int* empty,int k,int n)；求所有非终结符的FIRST集 string FIRST(string U,string u,string* first,string s)；//求符号串s=X1X2...Xn的FIRST集 string** create_table(string *P,string U,string u,int n,int t,int k,string* first)；//构造分析表 void analyse(string **table,string U,string u,int t,string s)；//分析符号串s 2、编写的源程序 #include #include #include using namespace std; void input_grammer(string *G)//输入文法G,n个非终结符 { int i=0;//计数 char ch='y'; while(ch=='y'){ cin>>G[i++]; cout<<"继续输入?(y/n)\n"; cin>>ch; } } void preprocess(string *G,string *P,string &U,string &u,int &n,int &t,int &k)//将文法G预处理产生式集合P，非终结符、终结符集合U、u， { int i,j,r,temp;//计数 char C;//记录规则中（）后的符号 int flag;//检测到（） n=t=k=0; for( i=0;i<50;i++) P[i]=" ";//字符串如果不初始化，在使用P[i][j]=a时将不能改变，可以用P[i].append(1,a) U=u=" ";//字符串如果不初始化，无法使用U[i]=a赋值，可以用U.append(1,a) for(n=0;!G[n].empty();n++) { U[n]=G[n][0]; }//非终结符集合，n为非终结符个数 for(i=0;i

英语语法大全(完整版)

【学英语必看】《英语语法手册》在实用英语备受青睐的现在，大家在学习英语和准备各种考试时，总是把听说读写放在首位，诚然，学习语言重在实践。但是，请不要忽视语法的作用，特别是在阅读和写作中，他能帮助你分析清楚句子结构，准确抓住句子的要点，更能帮你写出复杂而优美的长句。以下为你整理《英语语法手册》全集，不需背诵记忆，只要静下心阅读一遍，就能有所收获！宝宝更希望你能把他们融在平时的阅读写作里. [英语语法手册]关于词类和句子成分根据词的形式、意义及其在句中的功用将词分为若干类，叫做词类。一个句子由各个功用不同的部分所构成，这些部分叫做句子成分。学一个词，要学它的发音、拼法、意义，也要记它的词类；更重要的是要了解它和其他词的关系，及其在句中作什么句子成分。如China is in East Asia(中国位于东亚)一句中的China这个单词所属的词类是名词，在句子中作主语。词类(parts of speech) 英语的词通常分为十大类： 1）名词(noun，缩写为n.)是人和事物的名称，如pen(钢笔)，English(英语)，life(生活)。 2)代词(pronoun，缩写为pron.)是用来代替名词的词，如we(我们)，his(他的)，all(全部)。 3)形容词(adjective，缩写为adj.)用来修饰名词，如great(伟大的)，honest(诚实的)，difficult(困难的)。 4)数词(numeral，缩写为num.)是表示"多少"和"第几"的词，如four(四)，eighteen(十八)，first(第一)，eighth(十八)，hundred(一百)。

编译原理语法分析实验报告

编译原理语法分析实验报告 - 班级:XXX 学号:XXX 姓名:XXX 年月日 1、摘要: 用递归子程序法实现对pascal的子集程序设计语言的分析程序 2、实验目的: 通过完成语法分析程序，了解语法分析的过程和作用 3、任务概述实验要求:对源程序的内码流进行分析，如为文法定义的句子输出”是”否则输出”否”,根据需要处理说明语句填写写相应的符号表供以后代码生成时使用 4、实验依据的原理递归子程序法是一种自顶向下的语法分析方法，它要求文法是LL(1)文法。通过对文法中每个非终结符编写一个递归过程，每个过程的功能是识别由该非终结符推出的串，当某非终结符的产生式有多个候选式时，程序能够按LL(1)形式唯一地确定选择某个候选式进行推导，最终识别输入串是否与文法匹配。递归子程序法的缺点是:对文法要求高，必须满足LL(1)文法，当然在某些语言中个别产生式的推导当不满足LL(1)而满足LL(2)时，也可以采用多向前扫描一个符号的办法;它的另一个缺点是由于递归调用多，所以速度慢占用空间多，尽管这样，它还是许多高级语言，例如PASCAL，C等编译系统常常采用的语法分析方法。

(完整版)大学英语语法专项练习题

大学英语语法专项练习题一、时态 1. By the end of April Peter here for three months. A. will have stayed B. will stay C. stays D. has stayed 2. I'm awfully sorry, but I had no alternative. I simply _____ what I did. A. ought to have done B. have to do C. had to do D. must do 3. We ________our breakfast when an old man came to the door. A. just have had B. have just had C. just had D. had just had 4. Ever since the family moved to the suburbs last year, they________ better health. A. could have enjoyed B. had enjoyed C. have been enjoying D. are enjoying 5. I bought a new house last year, but I ______my old house yet, so at the moment I have two houses. A. did not sell B. have not sold C. had not sold D. do not sell 6. I decided to go to the library as soon as I ________. A. finish what I did B. finished what I did C. would finish what I was doing D. finished what I was doing 7. He _________when the bus came to a sudden stop. A. was almost hurt B. was hurt himself C. was to hurt himself D. was hurting himself 8. I suppose that when I come back in ten years' time all those old houses _______down. A. will have been pulled B. will have pulled C. will be pulling D. will be pulled 9. Bob's leg got hurt ________the Purple Mountains. A. while he is climbing up B. while we were climbing up C. while we climbed up D. while he climbed up 10. Pick me up at 8 o'clock. I _______ my bath by then. A. may have B. will be having C. can have had D. will have had 11. If you smoke in a non-smoking section people________. A. will object B. objected C. must object D. have objected 12. By the end of this month, we surely _______ a satisfactory solution to the problem A. have found B. will be finding C. are finding D. will have found 13. We __________to start our own business, but we never had enough money. A. have hope B. hope C. had hoped D. should hope 14. The gray building is where the workers live, and the white one is where the spare parts______ A. are producing B. are produced C. produced D. being produced 15. While people may refer to television for up-to-the-minute news, it is unlikely that television __________the newspaper completely. A. will replace B. have replaced C. replace D. replaced 16. It's reported that by the end of this month the output of cement in the factory ________by about 10%. A. will have risen B. has risen C. will be rising D. has been rising 17. Until then, his family___________ from him for six months. A. didn't hear B. hasn’t been hearing C. hasn't heard D. hadn't heard

语法分析程序报告

xx理工大学《编译原理》题目语法分析程序姓名：学号：班级：

一、实验目的编制一个递归下降分析程序，实现对词法分析程序所提供的单词序列的语法检查和结构分析。二、实验要求利用C语言编制递归下降分析程序，并对简单语言进行语法分析。 2.1 待分析的简单语言的语法用扩充的BNF表示如下： ⑴<程序>：：=begin<语句串>end ⑵<语句串>：：=<语句>{；<语句>} ⑶<语句>：：=<赋值语句> ⑷<赋值语句>：：=ID：=<表达式> ⑸<表达式>：：=<项>{+<项> | -<项>} ⑹<项>：：=<因子>{*<因子> | /<因子> ⑺<因子>：：=ID | NUM | （<表达式>） 2.2 实验要求说明输入单词串，以“#”结束，如果是文法正确的句子，则输出成功信息，打印“success”，否则输出“error”。例如：输入begin a:=9; x:=2*3; b:=a+x end # 输出success 输入x:=a+b*c end # 输出error 2.3 语法分析程序的酸法思想 ⑴主程序示意图如图2-1所示。图2-1 语法分析主程序示意图 ⑵递归下降分析程序示意图如图2-2所示。 ⑶语句串分析过程示意图如图2-3所示。

图2-2 递归下降分析程序示意图图2-3 语句串分析示意图 ⑷statement 语句分析程序流程如图2-4、2-5、2-6、2-7所示。图2-4 statement 语句分析函数示意图图2-5 expression 表达式分析函数示意图

图2-7 factor分析过程示意图三、语法分析程序的C语言程序源代码 #include "stdio.h" #include "string.h" char prog[100],token[8],ch; char *rwtab[6]={"begin","if","then","while","do","end"}; int syn,p,m,n,sum; int kk; factor(); expression(); yucu(); term(); statement(); lrparser(); scaner(); main() { p=kk=0; printf("\nGrade:05 Class:03 Name:Qiyubing Number:200507096 \n"); printf("\n----Please input the string end with '#':-------- \n"); do

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大学英语语法试题及答案(2) 第 2 单元题目： 1.More people visit the Air and Space Museum honoring men and women who have pioneered flight and the exploration of space than _____ any other monument or museum in the entire country. A) visit B) to visit C) visited D) visiting 题目： 2.I work in a little room off the main entrance _____ museum, checking coats and other articles which people do not want to carry around as they tour the building. A) to B) of C) at D) for 题目： 3.What apparently had happened, three years ago, was that Kate _____ to a different building. A) went B) has gone C) had gone D) would go 题目： 4.She had waited at another museum for days and had spent all her money _____ to find Sidney. A) tried B) trying C) to try D) try 题目： 5.Without facts we cannot form a worthwhile opinion for we need to have factual knowledge _____ our thinking. A) which to be based B) which to base upon C) upon which to base D) to which to be based 题目： 6.Helen believes if a man robs her of five dollars it is the same as if he _____ a hundred. A) takes B) will take C) took D) has taken 题目： 7.He had a cottage which consists _____ three rooms, a bathroom and kitchen. A) of B) with C) in D) by 题目： 8.Behind him Paul could hear the angry man _____ to break the door open. A) trying B) to try C) tried D) try 题目： 9.Some companies have introduced flexible working time with less emphasis on pressure _____. A) than more on efficiency B) and more efficiency C) and more on efficiency D) than efficiency 题目： 10.The gardener is taking care of the place, no one _____ there at present. A) living B) lives C) lived D) to live 题目： 11.The City Bank will pa fifty pounds to _____ who helps the police to catch the man. A) someone B) nobody C) anyone D) somebody 题目： 12.When Paul Carson saw the big red American car coming towards him, he stopped his won car at the side, _____ room for it to pass. A) to make B) made C) making D) make 题目： 13.What bothers me is _____ I paid for all this stuff that we don't want anymore. A) what B) that C) which D) who 题目： 14.A hinge joint is _____ permits forward and backward movement of a door. A) the B) whose C) what D) those 题目：15.Garage sales in the United States serve many purposes _____ cleaning out unwanted items and making money. A) besides B) except for C) except D) apart from 题目： 16.This is _____ the most difficult job I have ever tackled. A) by rights B) by itself C) by oneself D) by far

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编译原理实验报告实验名称：分析调试语义分析程序 TEST抽象机模拟器完整程序保证能用！！！！！一、实验目的通过分析调试TEST语言的语义分析和中间代码生成程序，加深对语法制导翻译思想的理解，掌握将语法分析所识别的语法畴变换为中间代码的语义翻译方法。二、实验设计

#include #include extern bool TESTparse(char *pFileName); extern int TESTScan(FILE *fin,FILE *fout); FILE *fin,*fout; //用于指定输入输出文件的指针 int main() { char szFinName[300]; char szFoutName[300]; printf("请输入源程序文件名（包括路径）:"); scanf("%s",szFinName); printf("请输入词法分析输出文件名（包括路径）："); scanf("%s",szFoutName); if( (fin = fopen(szFinName,"r")) == NULL) { printf("\n打开词法分析输入文件出错！\n"); return 0;

} if( (fout = fopen(szFoutName,"w")) == NULL) { printf("\n创建词法分析输出文件出错！\n"); return 0; } int es = TESTScan(fin,fout); fclose(fin); fclose(fout); if(es > 0) printf("词法分析有错，编译停止！共有%d个错误！\n",es); else if(es == 0) { printf("词法分析成功！\n"); int es = 0; es = TESTparse(szFoutName); //调语法分析 if(es== true) printf("语法分析成功！\n"); else printf("语法分析错误！\n"); }

薄冰实用英语语法详解

被动语态现在范畴一般现在时am/is/are made 现在进行时am / is /are being made 现在完成时has/have been made 过去范畴一般过去时was/were made 过去进行时was/werebeingmade 过去完成时had been made 将来范畴一般将来时shall/will be made 将来完成时shall/will have been made 过去将来时should/would be made 过去将来完成时should/would have been made 1. 被动语态的各种时态被动语态（The Passive Voice）是动词的一种形式，表示主语是谓语动词的承受者。被动语态便于论述客观事实，故常用于科技文章、新闻报道、书刊介绍以及景物描写。被动语态没有将来进行时、过去将来进行时和完成进行时形式。 (1) 一般现在时的被动语态 I am not so easily deceived. 我不会轻易上当受骗的。 Computers are widely used in the world. 计算机在世界范围内得到广泛应用。 (2) 一般过去时的被动语态 The car was seriously damaged. 汽车受到严重损坏。 Printing was introduced into Europe from China. 印刷术是由中国传入欧洲的。 (3) 现在进行时的被动语态 The question is being discussed at the meeting. 这个问题现在正在会上讨论。 The children are being taken care of by their aunt. 孩子们现在正由其姑妈照看。 (4) 过去进行时的被动语态 When I called, tea was being served. 当我来访时，正值上茶之际。 When they arrived，the experiments were being made. 他们到达时，实验正在进行。

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