#include <stdio.h>

int count_words(const char *file_in)
{
    if (file_in == NULL)
    {
        return -1;
    }

    FILE *f = fopen(file_in, "r");
    if (f == NULL)
    {
        return -1;
    }

    int word = 0;
    int count = 0;
    int c;
    while ((c = fgetc(f)) != EOF)
    {
        if ((c == ' ' || c == '\n' || c == '\t') && word == 1)
        {
            word = 0;
        }
        if (c != ' ' && c != '\n' && c != '\t' && word == 0)
        {
            word = 1;
            count++;
        }
    }

    return count;
}