hello.yy.c: hello.flex
	flex --outfile=hello.yy.c hello.flex
hello: hello.yy.c
	gcc -o hello hello.yy.c -ll
run: hello
	./hello < input/0

%{
%}
%%
\(      {
        printf("open\n");
       }
\)      {
        printf("close\n");
       }
[a-z]+ {
        printf("token_a-z\n");
       }
[A-Z]+ {
        printf("TOKEN_A-Z\n");
       }
\n     {
       }
.      {
       }
%%