hashing

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));    }}