C源代码单词扫描程序.doc

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1、院系：计算机学院实验课程:编译原理实验实验项目：C++源代码单词扫描程序（词法分析）指导老师：黄煜廉一．实验项目C++源代码单词扫描程序（词法分析）二．实验要求1.C++源代码扫描程序识别C++记号。C++语言包含了几种类型的记号：标识符，关键字，数（包括整数、浮点数），字符串、注释、特殊符号（分界符）和运算符号等。2.打开一个C++源文件，打印出所有以上的记号。3.要求应用程序应为Windows界面。4.选作部分：为了提高C++源程序的可读性，C++程序在书写过程中加入了空行、空格、缩进、注释等。假设你想牺牲可读性，以节省磁盘空间，那么你可以存贮一个删除了所有不必要空格

2、和注释的C++源程序的压缩文本。因此，程序中还应该有这样的压缩功能。1.选作部分：进一步思考或实现——如何进一步实现减小源文件大小的压缩功能。2.应该书写完善的软件文档。三．需求分析1.根据所需的功能程序应分为分析关键字、分析标识符、分析数字、分析串、分析注释、分析特殊字符和过滤多余字符几部分。2.关键字有iostream.h.main.while.gotoincludeforbreakcaseifstructclass等。3.过滤字符要考虑到空格和换行。四．实验代码五．#include六．#include七．#include

3、tring.h>八．#include九．#include十．FILE*fp;十一．charstring(charc[]);//字符串处理十二．charch;十三．char*operate[6]={"+","-","*","/","++","--"};十四．char*note[4]={"//","/*","*/","""};十五．char*symbol[31]={"%","$","^","&","_","#","<","<=","=",">",">=","<>","<<","==","!=","&&","

4、

5、","!",十六．",","

6、;",":=",".","(",")","{","}","&&","

7、

8、","!","()",">>"};十七．char*keyword[35]={"iostream.h","include","break","case","char","const","continue","default","do","double",十八．"else","enum","cin","float","for","goto","if","int","long","cout",十九．"return","short","signed","sizeof","static","struct","s

9、witch","typedef","printf",二十．"union","unsigned","void","volatile","while","main"};二十一．二十二．intsearch(charsearchstr[],inttype)//符号匹配查找二十三．{二十四．inti;二十五．switch(type)二十六．{二十七．case1:for(i=0;i<35;i++)二十八．{二十九．if(strcmp(keyword[i],searchstr)==0)三十．return1;三十一．三十二．}三十三．case2:三．{四．for(i=0;i<=5;i++

10、)五．{六．if(strcmp(operate[i],searchstr)==0)七．return1;八．}九．break;十．}十一．case3:for(i=0;i<31;i++)十二．{十三．if(strcmp(symbol[i],searchstr)==0)十四．return1;十五．}break;十六．case4:for(i=0;i<=3;i++)十七．{十八．十九．if(!strcmp(note[i],searchstr)&&i==3)二十．{二十一．string(searchstr);二十二．break;二十三．}二十四．elseif(!strcmp(note

11、[i],searchstr))二十五．return1;二十六．二十七．}break;二十八．}二十九．return0;三十．}三十一．三十二．charletter(charch)//字母处理三十三．{三十四．inti=-1;三十五．charletter[50];三十六．while(isalnum(ch)

12、

13、ch=='.')三十七．{三十八．letter[++i]=ch;三十九．ch=fgetc(fp);四十．}四十一．letter[i+1]='';四十二．if(search(letter,1))四十三．{四十四．cout<