%{
  #include<stdio.h>
%}
%option noyywrap
%%
"int"|"double"|"float"|"if"|"else"|"while"|"do"{
  printf("Keywords:%s\n",yytext);
}
[a-zA-Z_][a-zA-Z0-9_]*{
  printf("identifiers:%s\n",yytext);
}
%%
int main(){
 yylex();
 return 0;
}%{
  #include<stdio.h>
%}
%option noyywrap
%%
"int"|"double"|"float"|"if"|"else"|"while"|"do"{
  printf("Keywords:%s\n",yytext);
}
[a-zA-Z_][a-zA-Z0-9_]*{
  printf("identifiers:%s\n",yytext);
}
%%
int main(){
 yylex();
 return 0;
}

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