1 #include<stdio.h> 2 #define MAX 100 3 char ch,zifu[MAX]; 4 int zhongbie,p;/*zhongbie代表字符种别,p代表数组zifi的下标位置*/ 5 void cwh(); 6 main() 7 { 8     p=0; 9     gets(zifu);10     11         cwh();12         printf("%d",zhongbie);13     /*如何输出数字*/14 15 }16 void cwh()17 {18     int i,m;/*m用于记录linshi的下标*/19     char *guanjianzi[6]={"begin","if","then","while","do","end"};/*char*[]数组每个元素指向一个char型的变量,关键字数组记得zhongbie+1*/20     char shuangfuhao[2]={‘1‘,‘1‘};/*字符=1*/21     char linshi[8];22     for(i=0;i<8;i++)23         linshi[i]=NULL;/*定义一个临时存放字符串的数组用作比较*/24     m=0;25     ch=zifu[p++];26     /*开始识别字符种别*/27     while(ch==‘ ‘)28     {29         p++;30         ch=zifu[p];   31     }32     /*识别关键字或者标志符*/33     if((ch>=‘a‘&&ch<=‘z‘)||(ch>=‘A‘&&ch<=‘Z‘))34     {35          while((ch>=‘0‘&&ch<=‘9‘)||(ch>=‘a‘&&ch<=‘z‘)||(ch>=‘A‘&&ch<=‘Z‘))36         {37             linshi[m++]=ch;38             ch=zifu[p++];39         }40         p--;41         zhongbie=10;42         for(i=0;i<6;i++)  /*将识别出来的字符和已定义的标示符作比较 */43         {44             if(strcmp(linshi,guanjianzi[i])==0)45             {46                 zhongbie=i+1;47                 break;48             }49         }50     }51     /*识别数字*/52     else if((ch>=‘0‘&&ch<=‘9‘))53     {54         while((ch>=‘0‘&&ch<=‘9‘))55         {56             ch=zifu[++p];57         }58         zhongbie=11;59     }60 61 }