C：解除指向不完整類型錯誤的指針

Question

我在C中創建了一個聯繫人鏈接列表。它工作正常。但現在我想寫一個指定聯繫人的刪除功能（按名稱）我得到Error:"dereferencing pointer to incomplete type"。這裏是我的代碼：（儘管定義結構接觸）

struct contact 
{ 
    char name[100]; 
    char number[20]; 
    struct contact *next; 
}; 
int deleteByName(struct contact **hptr, char *name) 
{ 
    struct student *prev = NULL; 
    struct student *temp = *hptr; 
    while (strcmp(temp->name /*The Error is Here*/ , name) != 0 && (temp->next) != NULL) 
    { 
     prev = temp; 
     temp = temp->next; 
    } 
    if (strcmp(temp->name, name) == 0) 
    { 
     if (prev == NULL) 
      *hptr = temp->next; 
     else 
      prev->next = temp->next; 
     free(temp); 
     return 0; 
    } 
    printf("\nNAME '%s' WAS NOT FOUND TO BE DELETED.", name); 
    return -1; 
} 

我想知道爲什麼我得到這個錯誤。謝謝。

Answer 1

你next指針類型爲contact - 假設是一個錯字 - 這裏的更正後的代碼與錯別字固定 - 這compiles- HTH！

struct student 
{ 
    char name[100]; 
    char number[20]; 
    struct student *next; 
}; 

int deleteByName(struct student **hptr, char *name) 
{ 
    struct student *prev = NULL; 
    struct student *temp = *hptr; 
    while (strcmp(temp->name, name) != 0 && (temp->next) != NULL) 
    { 
     prev = temp; 
     temp = temp->next; //***No Error now*** 
    } 
    if (strcmp(temp->name, name) == 0) 
    { 
     if (prev == NULL) 
      *hptr = temp->next; 
     else 
      prev->next = temp->next; 
     free(temp); 
     return 0; 
    } 
    printf("\nNAME '%s' WAS NOT FOUND TO BE DELETED.", name); 
    return -1; 
}