lex program to count number of words, characters and lines from File

%{

#include<stdio.h>

int count=0;

int letter=0;

int lcount=0;

%}

%%

[a-zA-Z0-9] {letter++;}

" " {count++;}

"\n" {lcount++; count++; printf("\n Total words are: %d\n Total Letters are: %d\n Total Lines are: %d\n",count,letter,lcount); lcount=0; count=0; letter=0;}

%%

int yywrap()

{

return 1;

}

int main()

{

yyin=fopen("test.txt","r");

yylex();

return 0;

}

ScreenShot: