LEX PROGRAM to count the no of characters, words, and lines in a given input file

Program to count the no of characters, words, and lines in a given input file.

%{

#include<stdio.h>

int c=0,w=0,l=0,b=0;

%}

%%

[a-zA-Z0-9]+ {w++;c+=yyleng;}

[\n] {l++;}

[ ] {b++;}

%%

main(int argc,char*argv[ ])

{

yyin=fopen(argv[1],"r");

yylex();

printf("words %d\n char %d\n spaces %d\n lines %d\n",w,c,b,l);

}