词法分析程序源码.doc

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1、词法分析程序源码#include#include#include#includeFILE*in,*out;//文件输入输出指针intnum=0;//词的数量intquotationFlag=0,bracketFlag=0;//quotationFlag弓丨号标识,bracketFlag括弧标识voidsubletterhandler(char*1etter)//字母处理子程序if(strcmp(1etter,〃const〃)=0){num++;fprintf(out,〃％dCONSTTK%s〃，num,1ett

2、er);}elseif(strcmp(letter,nt〃)==0){num++;fprintf(out,〃％dINTTK%srT,num,letter);}elseif(strcmp(letter,z，float?，)==0){num++;fprintf(out,〃％dFLOATTK%s〃，num,1etter);}elseif(strcmp(letter,/，char/，)==0){num++;fprintf(out,〃％dCHARTK%s〃，num,1etter);elseif(strcmp(letter,/zmain，z)=0){num++;fprintf(out,〃％d

3、MAINTK%s，z,num,letter);elseif(strcmp(letter,〃if〃)=0){num++;fprintf(out,〃％dIFTK%s〃,num,letter);}elseif(strcmp(letter,〃else〃)=0){num++;fprintf(out,〃％dELSETK%s，z,num,letter);elseif(strcmp(letter,"do〃)=0){num++;fprintf(out,〃％dDOTK%s〃，num,letter);elseif(strcmp(letter,〃switch")=0){num++;fprintf(

4、out,〃％dSWITCHTK%s〃，num,letter);elseif(strcmp(letter,"case")二二0){num++;fprintf(out,"%dCASETK%s，z,num,letter);elseif(strcmp(letter,"default")=0){num++;fprintf(out,〃％dDEFAULTTK%srT,num,letter);elseif(strcmp(letter,〃for〃)=0){num++;fprintf(out,"%dFORTK%s〃，num,letter);elseif(strcmp(letter,〃scanf"

5、)=O){num++;fprintf(out,〃%dSCANFTK%s〃,num,letter);ijelseif(strcmp(letter,〃printf〃)=0){num++;fprintf(out,〃%dPRINTFTK%s",num,letter);ijelseif(strcmp(letter,〃returrT)=0){num++;fprintf(out,〃%dRETURNTK%s〃，num,letter);ijelse{//inta二0;intj;for(j=0;j<=strlen(letter);j++)if(letter[j]〉二'0’&&letter[j]〈二

6、'9')a=l;if(a=0){num++;fprintf(out,〃％dSTRCON%srT,num,letter);else{num++;fprintf(out,〃％dIDEN%s〃，num,letter);ijijcharletterhandler(charch){inti二0;charletter[50];if(quotationFlag==0){while(isalnum(ch)!=0){letter[i++]=ch;ch=fgetc(in);ijletter[i]=，?;subletterhandler(letter);Ijelseif(quotationFlag=l

7、){while(ch!二'‘’){letter[i++]=ch;ch=fgetc(in);ijletter[i]=，?;num++;fprintf(out,〃%dCHARCON%s〃，num,letter);Ijelse{while(ch!=，〃‘){letter[i++]=ch;ch二fgetc(in);ijletter[i]二'';nuni++;fprintf(out,〃%dSTRCON%s〃，n