lines_words_chars.txt

%{
    int l=0, w=0, c=0;
%}

%%
    [\n] {++l; ++w;}
    [' '] {++w;}
    . {++c;}
%%

int yywrap() {}

int main() {
    yylex();
    printf("No. of lines : %d\n", l);
    printf("No. of words : %d\n", w);
    printf("No. of characters : %d\n", c);
}