/*** Definition Section ***/
%{
int valid=0; int a = 0; int b = 0; expo=0;
%}

/*** Rule Section ***/
%%
^if|else|for|while|do|switch|int|char|float|double$ a++;  printf ("Valid Keyword\n");
^[a-z A-Z _][a-z A-Z _ 0-9]*$ valid++; printf("Valid Identifier");
^[/]{1}[/]{1}[a-zA-Z0-9]* b++; printf("Valid Comment");
^[/]{1}[*]+{1}[a-zA-Z0-9]*[*]{1}[/]{1} b++; printf("Valid Comment");
^[/]+[a-zA-z]*[0-9]*[/]+ b++; printf("Valid Comment");

^[0-9]*[.][0-9]+e^[0-9]*[.][0-9]+ expo++; printf("Valid Exponential");
^[0-9]+e^[0-9]+ expo++; printf("Valid Exponential");
^[0-9]*[.][0-9]+e^[0-9]+ expo++; printf("Valid Exponential");


\n {return 0;}
%%

/*** Code Section ***/
int yywrap(){}
int main(){
yylex();
if(valid == 0 && a ==0 && b==0 && expo==0)  printf("Invalid");
return 0;
}