%{
#include<stdio.h>
%}
%%
else   |
while  |
for    |
if     |
do     |
switch{     
	printf("%s is a keyword\n",yytext);
        return(0);
 }
[a-zA-Z_]+[a-zA-Z0-9_]*{
      printf("%s is a identifier\n",yytext);
      return(0); 
}
 
[=|+|-|*|/]*{
   	printf("%s is a operator\n",yytext);
	return(0);
}
.*{
    printf("%s is not an identifier\n",yytext);
    return(0);
}
%%
int main(){
    printf("enter a character/word. \n");
    yylex();
}
yywrap()
{
}

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