兼容的指針類型和結構問題

Question

#define HASH_SIZE 5 

// prototype 
int hash(char *word); 

// counter 
int counter; 

// node 
typedef struct node 
{ 
    char word[LENGTH + 1]; 
    struct node *next; 
} node; 

// hash table 
struct node *hashtable[HASH_SIZE]; 
    bool 
load(const char *dictionary) 
{ 
    // open the dictionary 
    FILE *dict = fopen(dictionary, "r"); 
    if(dict == NULL) 
    { 
     printf("Could not open %s.\n", dictionary); 
     return false; 
    } 

    // set all values in the hash table to null 
    for(int i = 0; i < HASH_SIZE; i++) 
    { 
     hashtable[i] = NULL; 
    } 

    // set the counter to 0 
    counter = 0; 

    // iterate through the words in the dictionary 
    while (!feof(dict)) 
    { 
     //declare a node 
     node *n = malloc(sizeof(node)); 

     // copy the word into the node 
     fscanf(dict, "%s", n.word); 

     // hash the word 
     int hash_value = hash(n.word); 

     // start saving addresses to the hashtable 
     n.next = hashtable[hash_value]; 
     hashtable[hash_value] = &n; 

     // that's one more! 
     counter++; 
    } 


    fclose(dict); 

    return true; 
} 

對於以下行：

 //declare a node 
    node *n = malloc(sizeof(node)); 

// hash the word 
    int hash_value = hash(n.word); 

    // start saving addresses to the hashtable 
    n.next = hashtable[hash_value]; 
    hashtable[hash_value] = &n;r code here 

我收到以下錯誤信息：

dictionary.c: In function 'load':
dictionary.c:112:29: error: request for member 'word' in something not a structure or union
dictionary.c:135:32: error: request for member 'word' in something not a structure or union
dictionary.c:138:10: error: request for member 'next' in something not a structure or union
dictionary.c:139:31: error: assignment from incompatible pointer type [-Werror]

有什麼問題？

Answer 1

真正簡單：

node *n = malloc(sizeof(node)); 
fscanf(dict, "%s", n.word); 

n是一個指向node，但n.word意味着n本身就是一個node。對於指針，語法有點不同。

fscanf(dict, "%s", n->word);