%{
#include <stdio.h>
 
int line = 1, word = 0, chars = 0;
%}
 
%%
 
[a-zA-Z0-9]+    { word++; chars += yyleng; }   // Count words and characters
\n              { line++; }                   // Count lines
.               { chars++; }                  // Count other characters
 
%%
 
int yywrap() { return 1; }
 
int main() {
    yyin = fopen("data.txt", "r");
    if (!yyin) {
        printf("Cannot open file data.txt\n");
        return 1;
    }
    yylex();
    printf("\nNumber of lines : %d", line);
    printf("\nNumber of words : %d", word);
    printf("\nNumber of characters : %d\n", chars);
    fclose(yyin);
    return 0;
}
 

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