编译原理词法分析器实验报告最终版.docx
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编译原理词法分析器实验报告最终版
学院(系)名称:
计算机工程系
姓名
学号
专业
班级
实验项目
实验一:
词法分析
课程名称
编译原理
课程代码
0310243
实验时间
2013年4月28日第1、2节
2013年5月7日第1、2节
实验地点
第一教学楼1508
批改意见
成绩
教师签字:
实验内容:
实现标准C语言词法分析器
实验目的:
1.掌握程序设计语言词法分析的设计方法;
2.掌握DFA的设计与使用方法;
3.掌握正规式到有限自动机的构造方法;
实验要求:
1.单词种别编码要求
基本字、运算符、界符:
一符一种;
标识符:
统一为一种;
常量:
按类型编码;
2.词法分析工作过程中建立符号表、常量表,并以文本文件形式输出;
3.词法分析的最后结果以文本文件形式输出;
4.完成对所设计词法分析器的功能测试,并给出测试数据和实验结果;
5.为增加程序可读性,请在程序中进行适当注释说明;
6.整理上机步骤,总结经验和体会;
7.认真完成并按时提交实验报告。
实验步骤:
1.基本思想:
从源程序中依次读入字符并解析,与关键字、运算符、结束符进行比较,得出其中的关键字,并将它存入到数组中去。
2.程序源代码:
#include
#defineMaxSize117//关键字的个数
#defineMaxSize220//运算符的个数
#defineMaxSize34//结束符的个数
//数据结构
structTNode
{
charvalue[20];//存放标识符的值
intnumber;//存放标识符的种别码
chardescription[20];//描述
}KeyWords[MaxSize1],Operation[MaxSize2],EndOperation[MaxSize3];
//存放关键字的数组
char*WordsBuff[MaxSize1]={"const","long","float","double","void","main","if","else","then","break","int","char","include","for","while","printf","scanf"};
//存放运算符的数组
char*OperationBuff[MaxSize2]={"+","-","*","/","+=","-=","*=","++","--","<","<=",">",">=","<>","=","(",")","#","{","}"};
charEndOperationBuff[MaxSize3]={'',';','\n','\t'};
//存放词法分析程序输出的结果
TNodeTable1[500];
TNodeVariable[100];//标识符表
TNodeConst[100];
//关键字数组初始化
voidinputKeyWords(char*buff[],intsize)
//关键字编码从1-size
for(inti=0;i{strcpy(KeyWords[i].value,buff[i]);KeyWords[i].number=i+1;strcpy(KeyWords[i].description,"关键字");}}//运算符数组初始化voidinputOperation(char*buff[],intsize){//运算符编码从50-(50+size)for(inti=0;i{strcpy(Operation[i].value,buff[i]);Operation[i].number=i+50;strcpy(Operation[i].description,"运算符");}}//结束符数组初始化voidinputEndOperation(charbuff[],intsize){//结束符编码从100-(100+size);for(inti=0;i{EndOperation[i].value[0]=buff[i];EndOperation[i].value[1]='\0';EndOperation[i].number=i+100;strcpy(EndOperation[i].description,"结束符");}}//输出数据结构数组中的信息voidoutputInfo(TNodea[],intsize){for(inti=0;i{printf("(%d",a[i].number);printf("\t");printf("%s)",a[i].value);printf("\t");printf(a[i].description);printf("\n");}}voidoutInfoToFile(TNodea[],intsize,FILE*out){//将词法分析程序的结果输出到文件中去for(inti=0;i{fprintf(out,"(%d",a[i].number);fprintf(out,"\t");fprintf(out,"%s)",a[i].value);fprintf(out,"\t");fprintf(out,a[i].description);fprintf(out,"\n");}}//从文件中读取一个字符//返回文件中读取的字符chargetChar(FILE*fp){charch=fgetc(fp);returnch;}//判读是否是运算符intisOperation(chara[]){//返回i表示是运算符在运算符数组中的位置//返回-1表示不是运算符intresult;for(inti=0;i{result=strcmp(a,Operation[i].value);if(result==0){returni;break;}}return-1;}//判读是否是关键字intisKeyWords(chara[]){//返回i表示在关键字表中的位置//返回-1表示不是关键字intresult;for(inti=0;i{result=strcmp(a,KeyWords[i].value);if(result==0){returni;break;}}return-1;}//判读是否是结束符intisEndOperation(chara){//返回i表示是结束符在结束符表中的位置//返回-1表示不是结束符for(inti=0;i{if(a==EndOperation[i].value[0]){returni;break;}}return-1;}//判读是否是字符intisChar(chara){//返回1表示是字符//返回0表示不是字符if(a>='a'&&a<='z')return1;elseif(a>'A'&&a<='Z')return1;elsereturn0;}//判读是否是数字intisDigit(chara){//返回1表示是数字//返回0表示不是数字if(a>='0'&&a<='9')return1;elsereturn0;}intcount=0;//记录结果表中的关键字及运算符等表项个数,用于返回intcount1=0;//记录标识符的表项个数intcount2=0;//记录常量的表项的个数//从屏幕上面获得字符并解析,返回在结果表中的表项intstart1(FILE*in){charbuff[20];//用于保存单词的缓冲区charnextchar[2];chartemp[20];//用于保存变量或常量的类型数组inti=0;//缓冲区指针inta;//比较的结果指针charop[3];//用于保存第一个运算符op[2]='\0';nextchar[0]=fgetc(in);nextchar[1]='\0';while(nextchar[0]!=EOF){if(isChar(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(isDigit(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(nextchar[0]=='\r'||nextchar[0]=='\n'){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理回车符与换行符nextchar[0]=fgetc(in);}elseif(isEndOperation(nextchar[0])!=-1){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);strcpy(temp,KeyWords[a].value);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}nextchar[0]=fgetc(in);}elseif((a=isOperation(nextchar))!=-1){//首先输出缓冲区中的数据buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理运算符op[0]=nextchar[0];nextchar[0]=fgetc(in);if(nextchar[0]!='@'){if(isOperation(nextchar)!=-1){op[1]=nextchar[0];if((a=isOperation(op))!=-1){//输出双目运算符strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}else{//错误的双目运算符strcpy(Table1[count].value,op);Table1[count].number=-1;strcpy(Table1[count].description,"未定义的运算符");count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}}else{//输出一元运算符op[1]='\0';a=isOperation(op);strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一}}}}returncount;}voidmain(){inputKeyWords(WordsBuff,MaxSize1);inputOperation(OperationBuff,MaxSize2);inputEndOperation(EndOperationBuff,MaxSize3);FILE*in,*out;boolFlag=true;while(Flag){printf("源文件的位置:C:\\input.txt\n");if((in=fopen("C:\\input.txt","r"))==NULL){printf("读取源文件失败!\n");exit(0);}if((out=fopen("C:\\out.txt","w"))==NULL){printf("打开文件失败!\n");exit(0);}intMaxSize=start1(in);printf("关键字及运算符\n");fprintf(out,"关键字及运算符\n");outputInfo(Table1,MaxSize);outInfoToFile(Table1,MaxSize,out);printf("标识符表:\n");fprintf(out,"标识符表:\n");outputInfo(Variable,count1);outInfoToFile(Variable,count1,out);printf("常量表:\n");fprintf(out,"常量表:\n");outputInfo(Const,count2);outInfoToFile(Const,count2,out);Flag=false;fclose(in);fclose(out);}}3.测试用例:inta=3;doubleb=4;intc;if(a>b)c=a;elsec=b;4.测试结果:5.心得体会:通过这次实验,我对编译原理这门专业必修课有了进一步的深层次了解,把理论知识应用于实验中,实验过程中对于转义字符,结束符、欠缺了考虑,在多次的调试和改进中最终完善了程序,而在调试过程中学习的知识得到了完善和补充,对词法分析器的理解更进一步。也让我重新熟悉了C++语言的相关内容,加深了对C++语言知识的深化和用途的理解。
strcpy(KeyWords[i].value,buff[i]);
KeyWords[i].number=i+1;
strcpy(KeyWords[i].description,"关键字");
}
//运算符数组初始化
voidinputOperation(char*buff[],intsize)
//运算符编码从50-(50+size)
for(inti=0;i{strcpy(Operation[i].value,buff[i]);Operation[i].number=i+50;strcpy(Operation[i].description,"运算符");}}//结束符数组初始化voidinputEndOperation(charbuff[],intsize){//结束符编码从100-(100+size);for(inti=0;i{EndOperation[i].value[0]=buff[i];EndOperation[i].value[1]='\0';EndOperation[i].number=i+100;strcpy(EndOperation[i].description,"结束符");}}//输出数据结构数组中的信息voidoutputInfo(TNodea[],intsize){for(inti=0;i{printf("(%d",a[i].number);printf("\t");printf("%s)",a[i].value);printf("\t");printf(a[i].description);printf("\n");}}voidoutInfoToFile(TNodea[],intsize,FILE*out){//将词法分析程序的结果输出到文件中去for(inti=0;i{fprintf(out,"(%d",a[i].number);fprintf(out,"\t");fprintf(out,"%s)",a[i].value);fprintf(out,"\t");fprintf(out,a[i].description);fprintf(out,"\n");}}//从文件中读取一个字符//返回文件中读取的字符chargetChar(FILE*fp){charch=fgetc(fp);returnch;}//判读是否是运算符intisOperation(chara[]){//返回i表示是运算符在运算符数组中的位置//返回-1表示不是运算符intresult;for(inti=0;i{result=strcmp(a,Operation[i].value);if(result==0){returni;break;}}return-1;}//判读是否是关键字intisKeyWords(chara[]){//返回i表示在关键字表中的位置//返回-1表示不是关键字intresult;for(inti=0;i{result=strcmp(a,KeyWords[i].value);if(result==0){returni;break;}}return-1;}//判读是否是结束符intisEndOperation(chara){//返回i表示是结束符在结束符表中的位置//返回-1表示不是结束符for(inti=0;i{if(a==EndOperation[i].value[0]){returni;break;}}return-1;}//判读是否是字符intisChar(chara){//返回1表示是字符//返回0表示不是字符if(a>='a'&&a<='z')return1;elseif(a>'A'&&a<='Z')return1;elsereturn0;}//判读是否是数字intisDigit(chara){//返回1表示是数字//返回0表示不是数字if(a>='0'&&a<='9')return1;elsereturn0;}intcount=0;//记录结果表中的关键字及运算符等表项个数,用于返回intcount1=0;//记录标识符的表项个数intcount2=0;//记录常量的表项的个数//从屏幕上面获得字符并解析,返回在结果表中的表项intstart1(FILE*in){charbuff[20];//用于保存单词的缓冲区charnextchar[2];chartemp[20];//用于保存变量或常量的类型数组inti=0;//缓冲区指针inta;//比较的结果指针charop[3];//用于保存第一个运算符op[2]='\0';nextchar[0]=fgetc(in);nextchar[1]='\0';while(nextchar[0]!=EOF){if(isChar(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(isDigit(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(nextchar[0]=='\r'||nextchar[0]=='\n'){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理回车符与换行符nextchar[0]=fgetc(in);}elseif(isEndOperation(nextchar[0])!=-1){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);strcpy(temp,KeyWords[a].value);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}nextchar[0]=fgetc(in);}elseif((a=isOperation(nextchar))!=-1){//首先输出缓冲区中的数据buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理运算符op[0]=nextchar[0];nextchar[0]=fgetc(in);if(nextchar[0]!='@'){if(isOperation(nextchar)!=-1){op[1]=nextchar[0];if((a=isOperation(op))!=-1){//输出双目运算符strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}else{//错误的双目运算符strcpy(Table1[count].value,op);Table1[count].number=-1;strcpy(Table1[count].description,"未定义的运算符");count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}}else{//输出一元运算符op[1]='\0';a=isOperation(op);strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一}}}}returncount;}voidmain(){inputKeyWords(WordsBuff,MaxSize1);inputOperation(OperationBuff,MaxSize2);inputEndOperation(EndOperationBuff,MaxSize3);FILE*in,*out;boolFlag=true;while(Flag){printf("源文件的位置:C:\\input.txt\n");if((in=fopen("C:\\input.txt","r"))==NULL){printf("读取源文件失败!\n");exit(0);}if((out=fopen("C:\\out.txt","w"))==NULL){printf("打开文件失败!\n");exit(0);}intMaxSize=start1(in);printf("关键字及运算符\n");fprintf(out,"关键字及运算符\n");outputInfo(Table1,MaxSize);outInfoToFile(Table1,MaxSize,out);printf("标识符表:\n");fprintf(out,"标识符表:\n");outputInfo(Variable,count1);outInfoToFile(Variable,count1,out);printf("常量表:\n");fprintf(out,"常量表:\n");outputInfo(Const,count2);outInfoToFile(Const,count2,out);Flag=false;fclose(in);fclose(out);}}3.测试用例:inta=3;doubleb=4;intc;if(a>b)c=a;elsec=b;4.测试结果:5.心得体会:通过这次实验,我对编译原理这门专业必修课有了进一步的深层次了解,把理论知识应用于实验中,实验过程中对于转义字符,结束符、欠缺了考虑,在多次的调试和改进中最终完善了程序,而在调试过程中学习的知识得到了完善和补充,对词法分析器的理解更进一步。也让我重新熟悉了C++语言的相关内容,加深了对C++语言知识的深化和用途的理解。
strcpy(Operation[i].value,buff[i]);
Operation[i].number=i+50;
strcpy(Operation[i].description,"运算符");
//结束符数组初始化
voidinputEndOperation(charbuff[],intsize)
//结束符编码从100-(100+size);
for(inti=0;i{EndOperation[i].value[0]=buff[i];EndOperation[i].value[1]='\0';EndOperation[i].number=i+100;strcpy(EndOperation[i].description,"结束符");}}//输出数据结构数组中的信息voidoutputInfo(TNodea[],intsize){for(inti=0;i{printf("(%d",a[i].number);printf("\t");printf("%s)",a[i].value);printf("\t");printf(a[i].description);printf("\n");}}voidoutInfoToFile(TNodea[],intsize,FILE*out){//将词法分析程序的结果输出到文件中去for(inti=0;i{fprintf(out,"(%d",a[i].number);fprintf(out,"\t");fprintf(out,"%s)",a[i].value);fprintf(out,"\t");fprintf(out,a[i].description);fprintf(out,"\n");}}//从文件中读取一个字符//返回文件中读取的字符chargetChar(FILE*fp){charch=fgetc(fp);returnch;}//判读是否是运算符intisOperation(chara[]){//返回i表示是运算符在运算符数组中的位置//返回-1表示不是运算符intresult;for(inti=0;i{result=strcmp(a,Operation[i].value);if(result==0){returni;break;}}return-1;}//判读是否是关键字intisKeyWords(chara[]){//返回i表示在关键字表中的位置//返回-1表示不是关键字intresult;for(inti=0;i{result=strcmp(a,KeyWords[i].value);if(result==0){returni;break;}}return-1;}//判读是否是结束符intisEndOperation(chara){//返回i表示是结束符在结束符表中的位置//返回-1表示不是结束符for(inti=0;i{if(a==EndOperation[i].value[0]){returni;break;}}return-1;}//判读是否是字符intisChar(chara){//返回1表示是字符//返回0表示不是字符if(a>='a'&&a<='z')return1;elseif(a>'A'&&a<='Z')return1;elsereturn0;}//判读是否是数字intisDigit(chara){//返回1表示是数字//返回0表示不是数字if(a>='0'&&a<='9')return1;elsereturn0;}intcount=0;//记录结果表中的关键字及运算符等表项个数,用于返回intcount1=0;//记录标识符的表项个数intcount2=0;//记录常量的表项的个数//从屏幕上面获得字符并解析,返回在结果表中的表项intstart1(FILE*in){charbuff[20];//用于保存单词的缓冲区charnextchar[2];chartemp[20];//用于保存变量或常量的类型数组inti=0;//缓冲区指针inta;//比较的结果指针charop[3];//用于保存第一个运算符op[2]='\0';nextchar[0]=fgetc(in);nextchar[1]='\0';while(nextchar[0]!=EOF){if(isChar(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(isDigit(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(nextchar[0]=='\r'||nextchar[0]=='\n'){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理回车符与换行符nextchar[0]=fgetc(in);}elseif(isEndOperation(nextchar[0])!=-1){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);strcpy(temp,KeyWords[a].value);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}nextchar[0]=fgetc(in);}elseif((a=isOperation(nextchar))!=-1){//首先输出缓冲区中的数据buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理运算符op[0]=nextchar[0];nextchar[0]=fgetc(in);if(nextchar[0]!='@'){if(isOperation(nextchar)!=-1){op[1]=nextchar[0];if((a=isOperation(op))!=-1){//输出双目运算符strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}else{//错误的双目运算符strcpy(Table1[count].value,op);Table1[count].number=-1;strcpy(Table1[count].description,"未定义的运算符");count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}}else{//输出一元运算符op[1]='\0';a=isOperation(op);strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一}}}}returncount;}voidmain(){inputKeyWords(WordsBuff,MaxSize1);inputOperation(OperationBuff,MaxSize2);inputEndOperation(EndOperationBuff,MaxSize3);FILE*in,*out;boolFlag=true;while(Flag){printf("源文件的位置:C:\\input.txt\n");if((in=fopen("C:\\input.txt","r"))==NULL){printf("读取源文件失败!\n");exit(0);}if((out=fopen("C:\\out.txt","w"))==NULL){printf("打开文件失败!\n");exit(0);}intMaxSize=start1(in);printf("关键字及运算符\n");fprintf(out,"关键字及运算符\n");outputInfo(Table1,MaxSize);outInfoToFile(Table1,MaxSize,out);printf("标识符表:\n");fprintf(out,"标识符表:\n");outputInfo(Variable,count1);outInfoToFile(Variable,count1,out);printf("常量表:\n");fprintf(out,"常量表:\n");outputInfo(Const,count2);outInfoToFile(Const,count2,out);Flag=false;fclose(in);fclose(out);}}3.测试用例:inta=3;doubleb=4;intc;if(a>b)c=a;elsec=b;4.测试结果:5.心得体会:通过这次实验,我对编译原理这门专业必修课有了进一步的深层次了解,把理论知识应用于实验中,实验过程中对于转义字符,结束符、欠缺了考虑,在多次的调试和改进中最终完善了程序,而在调试过程中学习的知识得到了完善和补充,对词法分析器的理解更进一步。也让我重新熟悉了C++语言的相关内容,加深了对C++语言知识的深化和用途的理解。
EndOperation[i].value[0]=buff[i];
EndOperation[i].value[1]='\0';
EndOperation[i].number=i+100;
strcpy(EndOperation[i].description,"结束符");
//输出数据结构数组中的信息
voidoutputInfo(TNodea[],intsize)
for(inti=0;i{printf("(%d",a[i].number);printf("\t");printf("%s)",a[i].value);printf("\t");printf(a[i].description);printf("\n");}}voidoutInfoToFile(TNodea[],intsize,FILE*out){//将词法分析程序的结果输出到文件中去for(inti=0;i{fprintf(out,"(%d",a[i].number);fprintf(out,"\t");fprintf(out,"%s)",a[i].value);fprintf(out,"\t");fprintf(out,a[i].description);fprintf(out,"\n");}}//从文件中读取一个字符//返回文件中读取的字符chargetChar(FILE*fp){charch=fgetc(fp);returnch;}//判读是否是运算符intisOperation(chara[]){//返回i表示是运算符在运算符数组中的位置//返回-1表示不是运算符intresult;for(inti=0;i{result=strcmp(a,Operation[i].value);if(result==0){returni;break;}}return-1;}//判读是否是关键字intisKeyWords(chara[]){//返回i表示在关键字表中的位置//返回-1表示不是关键字intresult;for(inti=0;i{result=strcmp(a,KeyWords[i].value);if(result==0){returni;break;}}return-1;}//判读是否是结束符intisEndOperation(chara){//返回i表示是结束符在结束符表中的位置//返回-1表示不是结束符for(inti=0;i{if(a==EndOperation[i].value[0]){returni;break;}}return-1;}//判读是否是字符intisChar(chara){//返回1表示是字符//返回0表示不是字符if(a>='a'&&a<='z')return1;elseif(a>'A'&&a<='Z')return1;elsereturn0;}//判读是否是数字intisDigit(chara){//返回1表示是数字//返回0表示不是数字if(a>='0'&&a<='9')return1;elsereturn0;}intcount=0;//记录结果表中的关键字及运算符等表项个数,用于返回intcount1=0;//记录标识符的表项个数intcount2=0;//记录常量的表项的个数//从屏幕上面获得字符并解析,返回在结果表中的表项intstart1(FILE*in){charbuff[20];//用于保存单词的缓冲区charnextchar[2];chartemp[20];//用于保存变量或常量的类型数组inti=0;//缓冲区指针inta;//比较的结果指针charop[3];//用于保存第一个运算符op[2]='\0';nextchar[0]=fgetc(in);nextchar[1]='\0';while(nextchar[0]!=EOF){if(isChar(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(isDigit(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(nextchar[0]=='\r'||nextchar[0]=='\n'){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理回车符与换行符nextchar[0]=fgetc(in);}elseif(isEndOperation(nextchar[0])!=-1){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);strcpy(temp,KeyWords[a].value);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}nextchar[0]=fgetc(in);}elseif((a=isOperation(nextchar))!=-1){//首先输出缓冲区中的数据buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理运算符op[0]=nextchar[0];nextchar[0]=fgetc(in);if(nextchar[0]!='@'){if(isOperation(nextchar)!=-1){op[1]=nextchar[0];if((a=isOperation(op))!=-1){//输出双目运算符strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}else{//错误的双目运算符strcpy(Table1[count].value,op);Table1[count].number=-1;strcpy(Table1[count].description,"未定义的运算符");count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}}else{//输出一元运算符op[1]='\0';a=isOperation(op);strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一}}}}returncount;}voidmain(){inputKeyWords(WordsBuff,MaxSize1);inputOperation(OperationBuff,MaxSize2);inputEndOperation(EndOperationBuff,MaxSize3);FILE*in,*out;boolFlag=true;while(Flag){printf("源文件的位置:C:\\input.txt\n");if((in=fopen("C:\\input.txt","r"))==NULL){printf("读取源文件失败!\n");exit(0);}if((out=fopen("C:\\out.txt","w"))==NULL){printf("打开文件失败!\n");exit(0);}intMaxSize=start1(in);printf("关键字及运算符\n");fprintf(out,"关键字及运算符\n");outputInfo(Table1,MaxSize);outInfoToFile(Table1,MaxSize,out);printf("标识符表:\n");fprintf(out,"标识符表:\n");outputInfo(Variable,count1);outInfoToFile(Variable,count1,out);printf("常量表:\n");fprintf(out,"常量表:\n");outputInfo(Const,count2);outInfoToFile(Const,count2,out);Flag=false;fclose(in);fclose(out);}}3.测试用例:inta=3;doubleb=4;intc;if(a>b)c=a;elsec=b;4.测试结果:5.心得体会:通过这次实验,我对编译原理这门专业必修课有了进一步的深层次了解,把理论知识应用于实验中,实验过程中对于转义字符,结束符、欠缺了考虑,在多次的调试和改进中最终完善了程序,而在调试过程中学习的知识得到了完善和补充,对词法分析器的理解更进一步。也让我重新熟悉了C++语言的相关内容,加深了对C++语言知识的深化和用途的理解。
printf("(%d",a[i].number);
printf("\t");
printf("%s)",a[i].value);
printf(a[i].description);
printf("\n");
voidoutInfoToFile(TNodea[],intsize,FILE*out)
//将词法分析程序的结果输出到文件中去
for(inti=0;i{fprintf(out,"(%d",a[i].number);fprintf(out,"\t");fprintf(out,"%s)",a[i].value);fprintf(out,"\t");fprintf(out,a[i].description);fprintf(out,"\n");}}//从文件中读取一个字符//返回文件中读取的字符chargetChar(FILE*fp){charch=fgetc(fp);returnch;}//判读是否是运算符intisOperation(chara[]){//返回i表示是运算符在运算符数组中的位置//返回-1表示不是运算符intresult;for(inti=0;i{result=strcmp(a,Operation[i].value);if(result==0){returni;break;}}return-1;}//判读是否是关键字intisKeyWords(chara[]){//返回i表示在关键字表中的位置//返回-1表示不是关键字intresult;for(inti=0;i{result=strcmp(a,KeyWords[i].value);if(result==0){returni;break;}}return-1;}//判读是否是结束符intisEndOperation(chara){//返回i表示是结束符在结束符表中的位置//返回-1表示不是结束符for(inti=0;i{if(a==EndOperation[i].value[0]){returni;break;}}return-1;}//判读是否是字符intisChar(chara){//返回1表示是字符//返回0表示不是字符if(a>='a'&&a<='z')return1;elseif(a>'A'&&a<='Z')return1;elsereturn0;}//判读是否是数字intisDigit(chara){//返回1表示是数字//返回0表示不是数字if(a>='0'&&a<='9')return1;elsereturn0;}intcount=0;//记录结果表中的关键字及运算符等表项个数,用于返回intcount1=0;//记录标识符的表项个数intcount2=0;//记录常量的表项的个数//从屏幕上面获得字符并解析,返回在结果表中的表项intstart1(FILE*in){charbuff[20];//用于保存单词的缓冲区charnextchar[2];chartemp[20];//用于保存变量或常量的类型数组inti=0;//缓冲区指针inta;//比较的结果指针charop[3];//用于保存第一个运算符op[2]='\0';nextchar[0]=fgetc(in);nextchar[1]='\0';while(nextchar[0]!=EOF){if(isChar(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(isDigit(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(nextchar[0]=='\r'||nextchar[0]=='\n'){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理回车符与换行符nextchar[0]=fgetc(in);}elseif(isEndOperation(nextchar[0])!=-1){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);strcpy(temp,KeyWords[a].value);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}nextchar[0]=fgetc(in);}elseif((a=isOperation(nextchar))!=-1){//首先输出缓冲区中的数据buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理运算符op[0]=nextchar[0];nextchar[0]=fgetc(in);if(nextchar[0]!='@'){if(isOperation(nextchar)!=-1){op[1]=nextchar[0];if((a=isOperation(op))!=-1){//输出双目运算符strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}else{//错误的双目运算符strcpy(Table1[count].value,op);Table1[count].number=-1;strcpy(Table1[count].description,"未定义的运算符");count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}}else{//输出一元运算符op[1]='\0';a=isOperation(op);strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一}}}}returncount;}voidmain(){inputKeyWords(WordsBuff,MaxSize1);inputOperation(OperationBuff,MaxSize2);inputEndOperation(EndOperationBuff,MaxSize3);FILE*in,*out;boolFlag=true;while(Flag){printf("源文件的位置:C:\\input.txt\n");if((in=fopen("C:\\input.txt","r"))==NULL){printf("读取源文件失败!\n");exit(0);}if((out=fopen("C:\\out.txt","w"))==NULL){printf("打开文件失败!\n");exit(0);}intMaxSize=start1(in);printf("关键字及运算符\n");fprintf(out,"关键字及运算符\n");outputInfo(Table1,MaxSize);outInfoToFile(Table1,MaxSize,out);printf("标识符表:\n");fprintf(out,"标识符表:\n");outputInfo(Variable,count1);outInfoToFile(Variable,count1,out);printf("常量表:\n");fprintf(out,"常量表:\n");outputInfo(Const,count2);outInfoToFile(Const,count2,out);Flag=false;fclose(in);fclose(out);}}3.测试用例:inta=3;doubleb=4;intc;if(a>b)c=a;elsec=b;4.测试结果:5.心得体会:通过这次实验,我对编译原理这门专业必修课有了进一步的深层次了解,把理论知识应用于实验中,实验过程中对于转义字符,结束符、欠缺了考虑,在多次的调试和改进中最终完善了程序,而在调试过程中学习的知识得到了完善和补充,对词法分析器的理解更进一步。也让我重新熟悉了C++语言的相关内容,加深了对C++语言知识的深化和用途的理解。
fprintf(out,"(%d",a[i].number);
fprintf(out,"\t");
fprintf(out,"%s)",a[i].value);
fprintf(out,a[i].description);
fprintf(out,"\n");
//从文件中读取一个字符
//返回文件中读取的字符
chargetChar(FILE*fp)
charch=fgetc(fp);
returnch;
//判读是否是运算符
intisOperation(chara[])
//返回i表示是运算符在运算符数组中的位置
//返回-1表示不是运算符
intresult;
for(inti=0;i{result=strcmp(a,Operation[i].value);if(result==0){returni;break;}}return-1;}//判读是否是关键字intisKeyWords(chara[]){//返回i表示在关键字表中的位置//返回-1表示不是关键字intresult;for(inti=0;i{result=strcmp(a,KeyWords[i].value);if(result==0){returni;break;}}return-1;}//判读是否是结束符intisEndOperation(chara){//返回i表示是结束符在结束符表中的位置//返回-1表示不是结束符for(inti=0;i{if(a==EndOperation[i].value[0]){returni;break;}}return-1;}//判读是否是字符intisChar(chara){//返回1表示是字符//返回0表示不是字符if(a>='a'&&a<='z')return1;elseif(a>'A'&&a<='Z')return1;elsereturn0;}//判读是否是数字intisDigit(chara){//返回1表示是数字//返回0表示不是数字if(a>='0'&&a<='9')return1;elsereturn0;}intcount=0;//记录结果表中的关键字及运算符等表项个数,用于返回intcount1=0;//记录标识符的表项个数intcount2=0;//记录常量的表项的个数//从屏幕上面获得字符并解析,返回在结果表中的表项intstart1(FILE*in){charbuff[20];//用于保存单词的缓冲区charnextchar[2];chartemp[20];//用于保存变量或常量的类型数组inti=0;//缓冲区指针inta;//比较的结果指针charop[3];//用于保存第一个运算符op[2]='\0';nextchar[0]=fgetc(in);nextchar[1]='\0';while(nextchar[0]!=EOF){if(isChar(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(isDigit(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(nextchar[0]=='\r'||nextchar[0]=='\n'){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理回车符与换行符nextchar[0]=fgetc(in);}elseif(isEndOperation(nextchar[0])!=-1){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);strcpy(temp,KeyWords[a].value);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}nextchar[0]=fgetc(in);}elseif((a=isOperation(nextchar))!=-1){//首先输出缓冲区中的数据buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理运算符op[0]=nextchar[0];nextchar[0]=fgetc(in);if(nextchar[0]!='@'){if(isOperation(nextchar)!=-1){op[1]=nextchar[0];if((a=isOperation(op))!=-1){//输出双目运算符strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}else{//错误的双目运算符strcpy(Table1[count].value,op);Table1[count].number=-1;strcpy(Table1[count].description,"未定义的运算符");count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}}else{//输出一元运算符op[1]='\0';a=isOperation(op);strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一}}}}returncount;}voidmain(){inputKeyWords(WordsBuff,MaxSize1);inputOperation(OperationBuff,MaxSize2);inputEndOperation(EndOperationBuff,MaxSize3);FILE*in,*out;boolFlag=true;while(Flag){printf("源文件的位置:C:\\input.txt\n");if((in=fopen("C:\\input.txt","r"))==NULL){printf("读取源文件失败!\n");exit(0);}if((out=fopen("C:\\out.txt","w"))==NULL){printf("打开文件失败!\n");exit(0);}intMaxSize=start1(in);printf("关键字及运算符\n");fprintf(out,"关键字及运算符\n");outputInfo(Table1,MaxSize);outInfoToFile(Table1,MaxSize,out);printf("标识符表:\n");fprintf(out,"标识符表:\n");outputInfo(Variable,count1);outInfoToFile(Variable,count1,out);printf("常量表:\n");fprintf(out,"常量表:\n");outputInfo(Const,count2);outInfoToFile(Const,count2,out);Flag=false;fclose(in);fclose(out);}}3.测试用例:inta=3;doubleb=4;intc;if(a>b)c=a;elsec=b;4.测试结果:5.心得体会:通过这次实验,我对编译原理这门专业必修课有了进一步的深层次了解,把理论知识应用于实验中,实验过程中对于转义字符,结束符、欠缺了考虑,在多次的调试和改进中最终完善了程序,而在调试过程中学习的知识得到了完善和补充,对词法分析器的理解更进一步。也让我重新熟悉了C++语言的相关内容,加深了对C++语言知识的深化和用途的理解。
result=strcmp(a,Operation[i].value);
if(result==0)
returni;
break;
return-1;
//判读是否是关键字
intisKeyWords(chara[])
//返回i表示在关键字表中的位置
//返回-1表示不是关键字
for(inti=0;i{result=strcmp(a,KeyWords[i].value);if(result==0){returni;break;}}return-1;}//判读是否是结束符intisEndOperation(chara){//返回i表示是结束符在结束符表中的位置//返回-1表示不是结束符for(inti=0;i{if(a==EndOperation[i].value[0]){returni;break;}}return-1;}//判读是否是字符intisChar(chara){//返回1表示是字符//返回0表示不是字符if(a>='a'&&a<='z')return1;elseif(a>'A'&&a<='Z')return1;elsereturn0;}//判读是否是数字intisDigit(chara){//返回1表示是数字//返回0表示不是数字if(a>='0'&&a<='9')return1;elsereturn0;}intcount=0;//记录结果表中的关键字及运算符等表项个数,用于返回intcount1=0;//记录标识符的表项个数intcount2=0;//记录常量的表项的个数//从屏幕上面获得字符并解析,返回在结果表中的表项intstart1(FILE*in){charbuff[20];//用于保存单词的缓冲区charnextchar[2];chartemp[20];//用于保存变量或常量的类型数组inti=0;//缓冲区指针inta;//比较的结果指针charop[3];//用于保存第一个运算符op[2]='\0';nextchar[0]=fgetc(in);nextchar[1]='\0';while(nextchar[0]!=EOF){if(isChar(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(isDigit(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(nextchar[0]=='\r'||nextchar[0]=='\n'){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理回车符与换行符nextchar[0]=fgetc(in);}elseif(isEndOperation(nextchar[0])!=-1){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);strcpy(temp,KeyWords[a].value);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}nextchar[0]=fgetc(in);}elseif((a=isOperation(nextchar))!=-1){//首先输出缓冲区中的数据buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理运算符op[0]=nextchar[0];nextchar[0]=fgetc(in);if(nextchar[0]!='@'){if(isOperation(nextchar)!=-1){op[1]=nextchar[0];if((a=isOperation(op))!=-1){//输出双目运算符strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}else{//错误的双目运算符strcpy(Table1[count].value,op);Table1[count].number=-1;strcpy(Table1[count].description,"未定义的运算符");count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}}else{//输出一元运算符op[1]='\0';a=isOperation(op);strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一}}}}returncount;}voidmain(){inputKeyWords(WordsBuff,MaxSize1);inputOperation(OperationBuff,MaxSize2);inputEndOperation(EndOperationBuff,MaxSize3);FILE*in,*out;boolFlag=true;while(Flag){printf("源文件的位置:C:\\input.txt\n");if((in=fopen("C:\\input.txt","r"))==NULL){printf("读取源文件失败!\n");exit(0);}if((out=fopen("C:\\out.txt","w"))==NULL){printf("打开文件失败!\n");exit(0);}intMaxSize=start1(in);printf("关键字及运算符\n");fprintf(out,"关键字及运算符\n");outputInfo(Table1,MaxSize);outInfoToFile(Table1,MaxSize,out);printf("标识符表:\n");fprintf(out,"标识符表:\n");outputInfo(Variable,count1);outInfoToFile(Variable,count1,out);printf("常量表:\n");fprintf(out,"常量表:\n");outputInfo(Const,count2);outInfoToFile(Const,count2,out);Flag=false;fclose(in);fclose(out);}}3.测试用例:inta=3;doubleb=4;intc;if(a>b)c=a;elsec=b;4.测试结果:5.心得体会:通过这次实验,我对编译原理这门专业必修课有了进一步的深层次了解,把理论知识应用于实验中,实验过程中对于转义字符,结束符、欠缺了考虑,在多次的调试和改进中最终完善了程序,而在调试过程中学习的知识得到了完善和补充,对词法分析器的理解更进一步。也让我重新熟悉了C++语言的相关内容,加深了对C++语言知识的深化和用途的理解。
result=strcmp(a,KeyWords[i].value);
//判读是否是结束符
intisEndOperation(chara)
//返回i表示是结束符在结束符表中的位置
//返回-1表示不是结束符
for(inti=0;i{if(a==EndOperation[i].value[0]){returni;break;}}return-1;}//判读是否是字符intisChar(chara){//返回1表示是字符//返回0表示不是字符if(a>='a'&&a<='z')return1;elseif(a>'A'&&a<='Z')return1;elsereturn0;}//判读是否是数字intisDigit(chara){//返回1表示是数字//返回0表示不是数字if(a>='0'&&a<='9')return1;elsereturn0;}intcount=0;//记录结果表中的关键字及运算符等表项个数,用于返回intcount1=0;//记录标识符的表项个数intcount2=0;//记录常量的表项的个数//从屏幕上面获得字符并解析,返回在结果表中的表项intstart1(FILE*in){charbuff[20];//用于保存单词的缓冲区charnextchar[2];chartemp[20];//用于保存变量或常量的类型数组inti=0;//缓冲区指针inta;//比较的结果指针charop[3];//用于保存第一个运算符op[2]='\0';nextchar[0]=fgetc(in);nextchar[1]='\0';while(nextchar[0]!=EOF){if(isChar(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(isDigit(nextchar[0])){buff[i]=nextchar[0];i++;nextchar[0]=fgetc(in);}elseif(nextchar[0]=='\r'||nextchar[0]=='\n'){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理回车符与换行符nextchar[0]=fgetc(in);}elseif(isEndOperation(nextchar[0])!=-1){buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);strcpy(temp,KeyWords[a].value);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}nextchar[0]=fgetc(in);}elseif((a=isOperation(nextchar))!=-1){//首先输出缓冲区中的数据buff[i]='\0';a=isKeyWords(buff);if(a!=-1&&i>0){strcpy(Table1[count].value,KeyWords[a].value);Table1[count].number=KeyWords[a].number;strcpy(Table1[count].description,KeyWords[a].description);count++;//计数器加一i=0;//清空缓冲区}elseif(i>0){if(isChar(buff[0])){//是标识符strcpy(Variable[count1].value,buff);Variable[count1].number=count1;strcpy(Variable[count1].description,"标识符");count1++;//计数器加一i=0;//清空缓冲区}elseif(isDigit(buff[0])){//是常量strcpy(Const[count2].value,buff);Const[count2].number=count2;strcpy(Const[count2].description,"常量");count2++;//计数器加一i=0;//清空缓冲区}}else{//缓冲区为空!}//处理运算符op[0]=nextchar[0];nextchar[0]=fgetc(in);if(nextchar[0]!='@'){if(isOperation(nextchar)!=-1){op[1]=nextchar[0];if((a=isOperation(op))!=-1){//输出双目运算符strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}else{//错误的双目运算符strcpy(Table1[count].value,op);Table1[count].number=-1;strcpy(Table1[count].description,"未定义的运算符");count++;//计数器加一//读取下一个字符nextchar[0]=fgetc(in);}}else{//输出一元运算符op[1]='\0';a=isOperation(op);strcpy(Table1[count].value,Operation[a].value);Table1[count].number=Operation[a].number;strcpy(Table1[count].description,Operation[a].description);count++;//计数器加一}}}}returncount;}voidmain(){inputKeyWords(WordsBuff,MaxSize1);inputOperation(OperationBuff,MaxSize2);inputEndOperation(EndOperationBuff,MaxSize3);FILE*in,*out;boolFlag=true;while(Flag){printf("源文件的位置:C:\\input.txt\n");if((in=fopen("C:\\input.txt","r"))==NULL){printf("读取源文件失败!\n");exit(0);}if((out=fopen("C:\\out.txt","w"))==NULL){printf("打开文件失败!\n");exit(0);}intMaxSize=start1(in);printf("关键字及运算符\n");fprintf(out,"关键字及运算符\n");outputInfo(Table1,MaxSize);outInfoToFile(Table1,MaxSize,out);printf("标识符表:\n");fprintf(out,"标识符表:\n");outputInfo(Variable,count1);outInfoToFile(Variable,count1,out);printf("常量表:\n");fprintf(out,"常量表:\n");outputInfo(Const,count2);outInfoToFile(Const,count2,out);Flag=false;fclose(in);fclose(out);}}3.测试用例:inta=3;doubleb=4;intc;if(a>b)c=a;elsec=b;4.测试结果:5.心得体会:通过这次实验,我对编译原理这门专业必修课有了进一步的深层次了解,把理论知识应用于实验中,实验过程中对于转义字符,结束符、欠缺了考虑,在多次的调试和改进中最终完善了程序,而在调试过程中学习的知识得到了完善和补充,对词法分析器的理解更进一步。也让我重新熟悉了C++语言的相关内容,加深了对C++语言知识的深化和用途的理解。
if(a==EndOperation[i].value[0])
//判读是否是字符
intisChar(chara)
//返回1表示是字符
//返回0表示不是字符
if(a>='a'&&a<='z')
return1;
elseif(a>'A'&&a<='Z')
else
return0;
//判读是否是数字
intisDigit(chara)
//返回1表示是数字
//返回0表示不是数字
if(a>='0'&&a<='9')
intcount=0;//记录结果表中的关键字及运算符等表项个数,用于返回
intcount1=0;//记录标识符的表项个数
intcount2=0;//记录常量的表项的个数
//从屏幕上面获得字符并解析,返回在结果表中的表项
intstart1(FILE*in)
charbuff[20];//用于保存单词的缓冲区
charnextchar[2];
chartemp[20];//用于保存变量或常量的类型数组
inti=0;//缓冲区指针
inta;//比较的结果指针
charop[3];//用于保存第一个运算符
op[2]='\0';
nextchar[0]=fgetc(in);
nextchar[1]='\0';
while(nextchar[0]!
=EOF)
if(isChar(nextchar[0]))
buff[i]=nextchar[0];i++;
elseif(isDigit(nextchar[0]))
elseif(nextchar[0]=='\r'||nextchar[0]=='\n')
buff[i]='\0';
a=isKeyWords(buff);
if(a!
=-1&&i>0)
strcpy(Table1[count].value,KeyWords[a].value);
Table1[count].number=KeyWords[a].number;
strcpy(Table1[count].description,KeyWords[a].description);
count++;//计数器加一
i=0;//清空缓冲区
elseif(i>0)
if(isChar(buff[0]))
//是标识符
strcpy(Variable[count1].value,buff);
Variable[count1].number=count1;
strcpy(Variable[count1].description,"标识符");
count1++;//计数器加一
elseif(isDigit(buff[0]))
//是常量
strcpy(Const[count2].value,buff);
Const[count2].number=count2;
strcpy(Const[count2].description,"常量");
count2++;//计数器加一
//缓冲区为空!
//处理回车符与换行符
elseif(isEndOperation(nextchar[0])!
=-1)
strcpy(temp,KeyWords[a].value);
elseif((a=isOperation(nextchar))!
//首先输出缓冲区中的数据
//处理运算符
op[0]=nextchar[0];
if(nextchar[0]!
='@')
if(isOperation(nextchar)!
op[1]=nextchar[0];
if((a=isOperation(op))!
//输出双目运算符
strcpy(Table1[count].value,Operation[a].value);
Table1[count].number=Operation[a].number;
strcpy(Table1[count].description,Operation[a].description);
//读取下一个字符
//错误的双目运算符
strcpy(Table1[count].value,op);
Table1[count].number=-1;
strcpy(Table1[count].description,"未定义的运算符");
//输出一元运算符
op[1]='\0';
a=isOperation(op);
returncount;
voidmain()
inputKeyWords(WordsBuff,MaxSize1);
inputOperation(OperationBuff,MaxSize2);
inputEndOperation(EndOperationBuff,MaxSize3);
FILE*in,*out;
boolFlag=true;
while(Flag)
printf("源文件的位置:
C:
\\input.txt\n");
if((in=fopen("C:
\\input.txt","r"))==NULL)
printf("读取源文件失败!
\n");
exit(0);
if((out=fopen("C:
\\out.txt","w"))==NULL)
printf("打开文件失败!
intMaxSize=start1(in);
printf("关键字及运算符\n");
fprintf(out,"关键字及运算符\n");
outputInfo(Table1,MaxSize);
outInfoToFile(Table1,MaxSize,out);
printf("标识符表:
fprintf(out,"标识符表:
outputInfo(Variable,count1);
outInfoToFile(Variable,count1,out);
printf("常量表:
fprintf(out,"常量表:
outputInfo(Const,count2);
outInfoToFile(Const,count2,out);
Flag=false;
fclose(in);
fclose(out);
3.测试用例:
inta=3;
doubleb=4;
intc;
if(a>b)
c=a;
c=b;
4.测试结果:
5.心得体会:
通过这次实验,我对编译原理这门专业必修课有了进一步的深层次了解,把理论知识应用于实验中,实验过程中对于转义字符,结束符、欠缺了考虑,在多次的调试和改进中最终完善了程序,而在调试过程中学习的知识得到了完善和补充,对词法分析器的理解更进一步。
也让我重新熟悉了C++语言的相关内容,加深了对C++语言知识的深化和用途的理解。
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