[Flex-help] Fwd: how to read input from a file in the scanner?

[pranay a. <str...@gm...>]

hi, i am using lex for the first time , i am trying to take input from a
file and not from the terminal , however i am facing problem please help
here is my lex file :


%{
#include <stdio.h>
int x=0,y=0;
%}

%%
'\n'   ++x,++y;
'.'    ++y;
%%
main()
{
extern FILE * yyin;
yyin= fopen("/home/username/example_test","r");
yyrestart(yyin);
printf("No. of lines is %d and no. of characters are %d\n",x,y);
}

the name of this file is test.l and the name of the input file is
example_test
i tried the following in command line in linux:
lex test.c
cc lex.yy.c -o test -ll
./test

and the output is 0 for both x and y when it should be 2 and 20 respectively
.

Is there a mistake in declaring the global variables x ,y?



-- 
pranay agarwal
Information Technology
Nit Durgapur
I blog at:
www.streetfi8er.blogspot.com