课程实验报告-某种简单程序语言的词法分析器的设计与实现

?编译原理?课程实验报告实验题目：某种简单程序语言的词法分析器的设计与实现专业： 计算机科学与技术班级：11060341学号：11060341姓名：intal=0,a2=0,a3=0,a4=0,a5=0;for(inti=O;ivk;i++)if(word[i].kind=1)al++;elseif(word[i].kind==2)a2++;elseif(word[i].kind==3)a3++;elseif(word[i].kind==4)a4++;elseif(word[i].kind=5)a5++;)printf("标识符：%d\n常量：%d\n关键字：%d\n界符：%d\n运算符：%d\nM,al,a2,a3,a4,a5);return0;)运行结果：实验目的：设计一个词法分析程序，理解词法分析器实现的原理，掌握程序设计语言中的各类单词的词法分析方法，加深对词法分析原理的理解。实验任务：词法分析是从左向右扫描每行源程序的符号，拼成单词，换成统一的二元式（单词种别，单词符号的属性值）表示。对给定的程序通过词法分析器识别一个个单词符号，并以二元式（单词种别，单词符号的属性值）显示，本程序那么是通过对给定程序段分析后以单词符号和文字提示显示）实验流程：程序清单：#include<iostream>#include<cstdio>#include<cstring>usingnamespacestd;intk=0;structword(charname[10];intkind;}word[1000];charkey[35][10]={nscanfV，short\,4nt\nlong,,；,float，V，double，V，charn；,struct，V，unionH,nprintf\ntypedef\nconstn,"unsigned0,nsigned,,,nextern,,,nregister,\nstatic,\,\olatile^'\oid\nifV'else^^witch^',case^,,forn；,do,,；,while,,；'goton,,'continue'\,'break,',,，defaultn,,,sizeof',nreturnn,ninclude，V，boor,)；boolcmp(chara[])(inti;for(intk=0;k<35;k++)(if(strcmp(a,key[k])=O)return1;)return0;)intmain()(#ifdefLOCALfreopen(nin.txtn,nrH,stdin);freopen(nout.txtH,,,w'\stdout);#endifintp,q,flag;chara[1000],b[10],ch;while(gets(a))(p=0；intlen=strlen(a);while(p<len)(ch=a[p];memset(b,0,sizeof(b));while(ch=，')(P++；ch=a[p];}if((ch>='a&&ch<='z')||(ch>='A'&&ch<=Z)||chD(flag=O;q=0;while((ch>=,a,&&ch<=,z,)||(ch>=,A,&&ch<=,Z,)||ch==t_，ll(ch>=,0,&&ch<='9,))(if((ch>='0&&ch<=9)||ch==])flag=l;b[q++]=ch;P++；ch=a[p];)if(flag==l)(strcpy(word[k].name,b);word[k++].kind=1;}elseif(flag==O)(if(ch='\"||ch=="")(strcpy(word|k].name,b);word|k++].kind=2;)elseif(cmp(b)==l)strcpy(word|k].name,b);word[k++].kind=3;elsestrcpy(word[k].name,b);word[k++].kind=l;)))elseif((ch>='0'&&ch<=9)||ch=='-'){intt=p-l;if(a[t]>=V&&a[t]<=<9,||a[t]>='a,&&a[t]<=,z,||a[t]>=,A'&&a[t]<=,Z,)(p++;ch=a[p];if(ch=='-'||ch==-*)(b[01；b[l]=ch;strcpy(word[k].name,b);word[k++].kind=5;ch=a[++p];)else(b[01；strcpy(word[k].name,b);word|k+4-|.kind=5;))else(q=0;b[q++]=ch;P++；ch=a[p];while((ch>=O&&ch<=9)||ch=Y)(b[q++]=ch;P++；ch=a[p];)strcpy(word|k].name,b);word[k++].kind=2;elseif(ch=W|ch=')'||ch=T||ch=Tllch='{'||ch=T||ch='J|ch=';'||ch=':'||ch=='\"||ch=，ch=’('|[ch==)||ch=TI|ch=TI|ch=T||ch=}||(b[O]=ch;strcpy(word[k].name,b);word|k++].kind=4;ch=a[++p];)elseif(ch=='%'||ch==，A，)(b[O]=ch;strcpy(word[k].name,b);word[k++].kind=5;ch=a[++p];)elseif(ch==,+,)(P++；ch=a[p];if(ch==,+,||ch==-1)(b[0]±4；b[l]=ch;strcpy(word[k].name,b);word[k++].kind=5;ch=a[++p]；}else(b[0]='+'；strcpy(word[k|.name,b);word[k++].kind=5;))elseif(ch=='*1)(P++；ch=a[p];if(ch=='*'||ch=='=')b[0]='*';b[l]=ch;strcpy(word[k].name,b);word[k++].kind=5;ch=a[++p];)else(b[0]='*';strcpy(word[k].name,b);word[k++].kind=5;))elseif(ch==7,)(P++；ch=a[p];if(ch==7*||ch==,=,)(b[0]=7;b[l]=ch;strcpy(word[k].name,b);word[k++].kind=5;ch=a[++p];)else(b[0]=7;strcpy(word[k].name,b);word[k++].kind=5;))elseif(ch==-*)(P++；ch=a[p];if(ch=-1)(b[O]=b[l]='=\strcpy(word[k].name,b);word[k++].kind=5;ch=a[++p];)elseb[0]='='；strcpy(word[k].name,b);word[k++].kind=5;))elseif(ch=='〉')(p++;ch=a[p];if(ch=->*11^==,=,)(b[0]=『b[l]=ch;strcpy(word[k].name,b);word[k++].kind=5;ch=a[++p];)else(b[0]=>'；strcpy(word[k].name,b);word[k++].kind=5;))elseif(ch=='<,)(p++；ch=a[p];if(ch=-<,||ch==-t)(b[0]=v；b[l]=ch;strcpy(word[k].name,b);word[k++].kind=5;ch=a[++p];)else(b[0尸<'；strcpy(word[k].name,b);word[k++].kind=5;))elseif(ch=='!*)p++;ch=a[p];if(ch==,=,){b[O]=T;b[l]=~；strcpy(word[k].name,b);word[k++].kind=5;ch=a[++p];)else(b[0]=T;strcpy(word[k].name,b);word[k++].kind=5;))elseif(ch==,&,)(P++；ch=a[p];if(ch==,&,)(b[O]=b[l]='&,;strcpy(word[k].name,b);word[k++].kind=5;ch=a[++p];)else(b[0]='&,;strcpy(word[k].name,b);word[k++].kind=5;})elseif(ch==T)(p++;ch=a[p];if(ch=T)(b[O]=b[l]=T;strcpy(word[k].name,b);word[k++].kind=5;ch=a[++p];)else{b[O]=T；strcpy(word[k].name,b);word[k++].kind=5;)))}for(