0916词法分析程序

#include<stdio.h>
#include<string.h>
#define N 80
void scaner(char a[],char *c[])
{
    int i=0,j=0,n=0,m=0;
    char b[N];
    while(a[i]!='#')
    {
         if(a[i]>=65&&a[i]<=122)
        {
            j=0;
            while((a[i]>=65&&a[i]<=122)||(a[i]>='0'&&a[i]<='9')||a[i]=='_')
            {
                b[j]=a[i];
                j++;
                i++;
            }
            i--;
            b[j]='\0';
            for(n=0;n<6;n++)
            {
                if(strcmp(b,c[n])==0)
                {
                    printf("<%d,%s>\n",n+1,c[n]);
                    m=1;
                    break;
                }
            }
            if(m==0) printf("<10,%s>\n",b);
         }
         else
         {
            switch(a[i])
            {
            case '+': printf("<13,+>\n");break;
            case '-': printf("<14,->\n");break;
            case '*': printf("<15,*>\n");break;
            case '/': printf("<16,/>\n");break;
            case ':':if(a[i+1]=='=')
                     {
                         printf("<18,:=>\n");
                         i++;
                     } 
                else printf("<17,:>\n");
                break;
            case '<': if(a[i+1]=='=')
                     {
                         printf("<21,<=>\n");
                         i++;
                     }
                else if(a[i+1]=='>')
                {
                    printf("<22,<>>\n");
                    i++;
                }
                else printf("<20,<>\n");
                break;
            case '>': if(a[i+1]=='=')
                     {
                         printf("<24,>=>\n");
                         i++;
                     } 
                else printf("<23,>>\n");
                break;
            case '=': printf("<25,=>\n");break;
            case ';': printf("<26,;>\n");break;
            case '(': printf("<27,(>\n");break;
            case ')': printf("<28,)>\n");break;
            case' ': break;
            case'\n': break;
            default:
                if(a[i]>='0'&&a[i]<='9')    
                    printf("<11,%c>\n",a[i]);
                else 
                    printf("'%c'输入错误！\n",a[i]);
                    break;
            }
         }
         i++;
    }
    if(a[i]=='#')  printf("<0,#>\n");
}
main()
{
    int i;
    char a[N];
    char *c[6]={"begin","if","then","while","do","end"};
    printf("请输入源程序：(以#结束)\n");
    for(i=0;i<N;i++)
    {
        scanf("%c",&a[i]);
        if(a[i]=='#')
            break;
    }
    a[i+1]='\0';
    i=0;
    printf("识别出的种别码为：\n");
    scaner(a,c);
}