static inline
        unsigned long int hashValue(const char *key, const unsigned long int buckets)
{
        register unsigned long int result = 0;
    
        if(!key)
                return 0;
        while(*key)
                result = result * 31 + *(key++);
    
        return (result % buckets);
}

int main(void) {
    int i;
    int buckets = 7;
    
    const char *keys[] = {
            "oneword",
            "wordone",
            "wordtwo",
            "threewd",
            "wordfr4",
            "hithere",
            0
    };
    
    for(i = 0; keys[i]; i++) {
        printf("%s hashes to:\t%d\n", keys[i],
               hashValue(keys[i], buckets));
    }
}