%option noyywrap
 
%{
int char_count = 0;
int word_count = 0;
int line_count = 0;
%}
 
%%
\n  { line_count++; }
[a-zA-Z0-9]+ { word_count++; }
.  { char_count++; }
 
%%
 
int main(int argc, char **argv) {
    if (argc > 1) {
        yyin = fopen(argv[1], "r");
        if (!yyin) {
            perror(argv[1]);
            return 1;
        }
    }
 
    yylex();
 
    if (yyin != stdin) {
        fclose(yyin);
    }
 
    printf("Characters: %d\n", char_count);
    printf("Words: %d\n", word_count);
    printf("Lines: %d\n", line_count);
 
    return 0;
}

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