#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;
}
}
}
}
}
