将字典单词插入哈希表

时间:2018-02-03 21:33:33

标签: c hash hashtable hashcode

我正在做一个将字典单词插入哈希表的项目。如果发生冲突,则将新单词散列到下一个相同的位置。我创建了一个指针数组:

typedef struct WordNode * WordNodeP;
typedef struct WordNode
{
    char word[WORDSIZE];
    struct WordNodeP *next;
}WordNodeT;
WordNodeP table[TABLESIZE];

我通过以下函数将字典中的每个单词散列到数组的指针中:

散列函数:

int hashFunction(char word[])                   //This function takes a string of word and break down each letter
{                                           //to integer value and use hash function. Then sum up all the values.
int i = 0;
int sum = 0;
while(word[i]!='\0'){
   if((int)word[i] < 97)      //If the ASC value of the letter is less than 97. It means it is a cap letter
       sum+= 3*(i+1)*(i+1)*(word[i]+32);
   else
        sum+= 3*(i+1)*(i+1)*word[i];
    i++;
}
if(sum > TABLESIZE)            //TABLESIZE = 12001;
    sum = sum % TABLESIZE;
return sum;
}

addWord:

void addWord(int val,char word[])             //This function adds words to specific index of array of LinkedList
{
    if(table[val]!=NULL){                       //If the position is occupied
    WordNodeT *temp = createNewNode(word);

    temp->next = table[val]->next;
    table[val]->next = temp;
}
    //printf("%s",table[val]->word);

    //printf("%s\n",table[val]->word);
else
    table[val] = createNewNode(word);                 //hash in the word to the table
}

CreateNewNode:

WordNodeP createNewNode(char word[])
{
WordNodeT* newNode = (WordNodeT*)malloc(sizeof(WordNodeT));

strcpy(newNode->word,word);
//printf("%s", newNode->word);
newNode->next = NULL;

return newNode;

}

问题在于查找功能。无论传入哪个单词,它总是返回0(未找到);

查找

int lookup(char * word)                                    //see if word exists in the dictionary
{
int val;
val = hashFunction(word);
printf("hash value is %d\n",val);
WordNodeT *temp = table[val];
while(temp!=NULL){           //all the way through
    if(strcmp(temp->word,word)== 0){
        return 1;
    }
    temp = temp->next;
}
return 0;

}

请注意,我把

printf("hash value is %d\n",val) 

在查找hashValue中查找。

主要是我代码:

printf("%d\n",lookup("hello"));

对于输出,我得到了5848的hashValue和0的返回值。 因为我的返回值为0,所以我编码用于检查目的:

    WordNodeT *temp = table[5948];
while (temp->word!=NULL){
    printf("%s",temp->word);
    temp = temp->next;
}

打印出其他单词,其中一个是“扇贝”,我计算了它的hashValue,“扇贝”的hashValue :((1 ^ 2 * 3 * 115)+(2 ^ 2 * 3 * 99)+ (3 ^ 2 * 3 * 97)+(4 ^ 2 * 3 * 108)+(5 ^ 2 * 3 * 108)+(6 ^ 2 * 3 * 111)+(7 ^ 2 * 3 * 112)) %TABLESIZE(12001)= 9885;

那么你们可以帮助我吗?

0 个答案:

没有答案