词法分析

#include <stdio.h>  
#include <string.h>   
char *syst[6]={"begin","if","then","while","do","end"};  
main()  
{  
    int syn,sum;   
     p=0;  
    printf("\n 请输入一个字符串(用$结束):\n");  
      
    do{  
            scanf("%c",&ch);  
            prog[p++]=ch;  
    }while(ch!='$');  
      
    p=0;  
    do{  
            scaner();  
            switch(syn)  
            {  
                case 11:  
                    printf("( %-10d%5d )\n",sum,syn);  
                break;  
                  
                case -1:  
                    printf("you have input a wrong string\n");  
                    //getch();  
                    return 0;  
                break;  
                  
                default:   
                printf("( %-10s%5d )\n",token,syn);  
                break;  
            }  
        }while(syn!=0);  
    //getch();  
 }