学步园

unsigned int BKDRHash(char *str)  
{  
    unsigned int seed = 131; // 31 131 1313 13131 131313 etc..  
    unsigned int hash = 0;  
  
    while (*str)  
    {  
        hash = hash * seed + (*str++);  
    }  
  
    return (hash & 0x7FFFFFFF);  
}