#include<stdio.h>main(){    char n[100],n1[100],n2[100];    int i,i1=0,i2=0,j;    printf("请你输入字符串：\n");    gets(n);      for(i=0;i<n;i++)    {        j=(int) n[i];        n1[i]=n[100];        if((j>=65) && (j<=90)||(j>=90) && (j<=122))        {            n1[i1]=n[i];            i1++;        }        else{             while(i1!=0)            {               n1[i1]=‘\0‘;               if(strcmp(n1,"auto")==0||strcmp(n1,"int")==0||strcmp(n1,"double")==0||strcmp(n1,"long")==0||strcmp(n1,"char")==0||strcmp(n1,"float")==0||strcmp(n1,"short")==0||strcmp(n1,"signed")==0||strcmp(n1,"unsigned")==0||strcmp(n1,"struct")==0||strcmp(n1,"union")==0||strcmp(n1,"enum")==0||strcmp(n1,"static")==0||strcmp(n1,"switch")==0||strcmp(n1,"case")==0||strcmp(n1,"default")==0                         ||strcmp(n1,"break")==0||strcmp(n1,"register")==0||strcmp(n1,"const")==0||strcmp(n1,"volatile")==0||strcmp(n1,"typedef")==0||strcmp(n1,"extern")==0||strcmp(n1,"return")==0||strcmp(n1,"void")==0||strcmp(n1,"continue")==0||strcmp(n1,"do")==0||strcmp(n1,"while ")==0||strcmp(n1,"if")==0||strcmp(n1,"else")==0||strcmp(n1,"for")==0||strcmp(n1,"goto")==0||strcmp(n1,"sizeof")==0)             {               n1[i1]=‘)‘;               printf("(关键字，");               puts(n1);               i1=0;               memset(n1,0,100);             }              else             {               n1[i1]=‘)‘;               printf("(标识符，");               puts(n1);               i1=0;               memset(n1,0,100);             }           }          if((j>48)&& (j<57))         {             n2[i2]=n[i];             i2++;         }         else{               if((int) n[i-1]>48 && (int) n[i-1]<57)               {n2[i2]=‘)‘;               printf("(常数，");               puts(n2);               i2=0;               memset(n2,0,100);}         if(j==42||j==43||j==45||j==47||j==61||j==62||j==60)        {           if((int) n[i+1]==61)            {                  printf("(运算符，%c=)",n[i]);                  printf("\n");                  i=i+1;            }            else            {                printf("(运算符，%c)",n[i]);                printf("\n");            }        }        else if(j==32)        {        }        else if(j==33||j==44||j==46||j==58||j==59||j==63||j==44)        {            printf("(界符，%c）",n[i]);            printf("\n");        }        else if(j==34||j==35||j==38||j==39||j==40||j==41||j==123||j==124||j==125||j==126)        {            printf("(特殊符号，%c）",n[i]);            printf("\n");        }        else        {            break;        }    }    }  }}