編譯詞法研究分析器實(shí)驗(yàn)報(bào)告

1、個(gè)人收集整理僅供參考學(xué)習(xí)編譯原理實(shí)驗(yàn)報(bào)告詞法分析器院系：班級：姓名：學(xué)號(hào)：1 / 8個(gè)人收集整理僅供參考學(xué)習(xí)詞法分析器實(shí)驗(yàn)報(bào)告一、實(shí)驗(yàn)?zāi)康兀涸O(shè)計(jì)一個(gè)詞法分析程序， 理解詞法分析器實(shí)現(xiàn)地原理， 掌握程序設(shè)計(jì)語言中地各類單詞地詞法分析方法，加深對詞法分析原理地理解 .b5E2RGbCAP二、實(shí)驗(yàn)原理：詞法分析是從左向右掃描每行源程序地符號(hào)， 拼成單詞，換成統(tǒng)一地二元式(單詞種別碼，單詞符號(hào)地屬性值 )表示 .對給定地程序通過詞法分析器識(shí)別一個(gè)個(gè)單詞符號(hào)，并以二元式 (單詞種別碼，單詞符號(hào)地屬性值 )顯示，本程序則是通過對給定路徑地文件地分析后以單詞符號(hào)和文字提示顯示） p1EanqFDPw三、實(shí)驗(yàn)

2、說明 :(1)關(guān)鍵字： "begin","end","if","then","else","while","write","read",DXDiTa9E3d"do", "call","const","char","until","procedure","repeat"RTCrpUDGiT(2)運(yùn)算符

3、： "+","-","*","/","="(3)界符： "","","","","",",",".","(",")",":"(4)其他標(biāo)記如字符串，表示以字母開頭地標(biāo)識(shí)符(5)空格、回車、換行符跳過(6)運(yùn)行結(jié)果在屏幕上以如下格式顯示：1$無符號(hào)整數(shù)begin$關(guān)鍵字if$關(guān)鍵字+$運(yùn)算符； $界符

4、a$普通標(biāo)識(shí)符/“$“為美元符號(hào)，不是大寫字母S5PCzVD7HxA測試功能時(shí)， 可以多次設(shè)置包含不同字符， 關(guān)鍵字地待解析文件， 但要保證輸入文件和后綴名時(shí)準(zhǔn)確無誤，仔細(xì)察看運(yùn)行結(jié)果，檢測該分析器地分析結(jié)果是否正確 jLBHrnAILg四、源代碼：#include <iostream>#include<string>using namespace std;#defineMAX 22char ch =' 'string2 / 8個(gè)人收集整理僅供參考學(xué)習(xí)key15="begin","end","if&quo

5、t;,"then","else","while","write","read", xHAQX74J0X "do", "call","const","char","until","procedure","repeat" LDAYtRyKfEint Iskey(string c)/關(guān)鍵字判斷int i;for(i=0;i<MAX;i+) if(keyi.c

6、ompare(c)=0) return 1;return 0;int IsLetter(char c) /判斷是否為字母if(c<='z')&&(c>='a')|(c<='Z')&&(c>='A') return 1; Zzz6ZB2Ltk else return 0;int IsDigit(char c)/判斷是否為數(shù)字if(c>='0'&&c<='9') return 1;else return 0;void a

7、nalyse(FILE *fpin)string arr=""while(ch=fgetc(fpin)!=EOF) arr=""if(ch=' '|ch='t'|ch='n')else if(IsLetter(ch)while(IsLetter(ch)|IsDigit(ch) if(ch<='Z')&&(ch>='A') ch=ch+32;arr=arr+ch;ch=fgetc(fpin);fseek(fpin,-1L,SEEK_CUR);if (

8、Iskey(arr)cout<<arr<<"t$ 關(guān)鍵字 "<<endl;elsecout<<arr<<"t$ 普通標(biāo)識(shí)符 "<<endl;else if(IsDigit(ch)while(IsDigit(ch)|ch='.'&&IsDigit(fgetc(fpin)arr=arr+ch;ch=fgetc(fpin);fseek(fpin,-1L,SEEK_CUR);cout<<arr<<"t$ 無符號(hào)實(shí)數(shù) "

9、;<<endl;else switch(ch)case'+':3 / 8個(gè)人收集整理僅供參考學(xué)習(xí)case'-' :case'*' :case'=' :case'/' :cout<<ch<<"t$運(yùn)算符 "<<endl;break;case'(' :case')' :case'' :case'' :case'' :case'.' :case',&#

10、39; :case'' :case'' :cout<<ch<<"t$界符 "<<endl;break;case':' :ch=fgetc(fpin);if(ch='=') cout<<":="<<"t$ 運(yùn)算符 "<<endl;else cout<<"="<<"t$ 運(yùn)算符 "<<endl;fseek(fpin,-1L,SEE

11、K_CUR);break;case'>' :ch=fgetc(fpin);if(ch='=') cout<<">="<<"t$ 運(yùn)算符 "<<endl; if(ch='>')cout<<">>"<<"t$ 輸入控制符 "<<endl; else cout<<">"<<"t$運(yùn)算符 "<<

12、endl;fseek(fpin,-1L,SEEK_CUR);break;case'<' :ch=fgetc(fpin);if(ch='=')cout<<"<="<<"t$ 運(yùn)算符 "<<endl;else if(ch='<')cout<<"<<"<<"t$ 輸出控制符"<<endl;else if(ch='>') cout<<&quo

13、t;<>"<<"t$ 運(yùn)算符 "<<endl; elsecout<<"<"<<"t$ 運(yùn)算符 "<<endl;fseek(fpin,-1L,SEEK_CUR);break;default : cout<<ch<<"t$無法識(shí)別字符 "<<endl;void main()char in_fn30;FILE * fpin;cout<<"請輸入源文件名（包括路徑和后綴名） :&

14、quot; for(;)cin>>in_fn;if(fpin=fopen(in_fn,"r")!=NULL) break;else cout<<"文件路徑錯(cuò)誤！請輸入源文件名（包括路徑和后綴名）:"4 / 8個(gè)人收集整理僅供參考學(xué)習(xí)cout<<"n*分析如下*"<<endl;dvzfvkwMI1analyse(fpin);fclose(fpin);cout<<endl;cout<<"按任意鍵結(jié)束 "<<endl;int a;cin&

15、gt;>a;運(yùn)行結(jié)果截圖：輸入：輸出：5 / 8個(gè)人收集整理僅供參考學(xué)習(xí)生成地單詞表目標(biāo)文件：版權(quán)申明本文部分內(nèi)容，包括文字、圖片、以及設(shè)計(jì)等在網(wǎng)上搜集整理.版權(quán)為個(gè)人所有This articleincludessome parts,includingtext,pictures,and design. Copyright is personal ownership.rqyn14ZNXI6 / 8個(gè)人收集整理僅供參考學(xué)習(xí)用戶可將本文地內(nèi)容或服務(wù)用于個(gè)人學(xué)習(xí)、研究或欣賞，以及其他非商業(yè)性或非盈利性用途， 但同時(shí)應(yīng)遵守著作權(quán)法及其他相關(guān)法律地規(guī)定，不得侵犯本網(wǎng)站及相關(guān)權(quán)利人地合法權(quán)利. 除此以

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