C 使用函数将字符串值分配给结构中的字符串元素

Question

我需要将一个字符串(大小为 [255] 的字符)分配给结构中的元素。该结构如下所示:

struct node{
   int ID, YEAR, MONTH, DAY
   char CATEGORY[255], DETAIL[255];
   double AMOUNT;
   struct node * next;
}
 struct node * head = NULL;

我有代码从文本文件中获取值并将其设置为变量，然后将其传递给 add_struct 函数，如下所示:

void add_struct(int i, char c, char d, double a, int y, int m, int da){
   if (head == NULL){
        head = (struct node *) malloc(sizeof(struct node));
        head->ID = i;
        head->CATEGORY = c;
        head->DETAIL = d;
        head->AMOUNT = a;
        head->YEAR = y;
        head->MONTH = m;
        head->DAY = da;
  }

  else {
        struct node * p = head;
        while(p->next != NULL) p = p->next;
        p->next = (struct node *) malloc(sizeof(struct node));
        p->next->ID = i;
        p->next->CATEGORY = c;
        p->next->DETAIL = d;
        p->next->AMOUNT = a;
        p->next->YEAR = y;
        p->next->MONTH = m;
        p->next->DAY = da;
   }
}

我收到错误消息:

"incompatible types when assigning to type 'char[255]' from type 'char'"

如何正确地将这些值分配给元素 CATEGORY 和 DETAIL？

Answer 1

结构体的 CATEGORY 和 DETAIL 字段定义为 255 个字符的数组，而 c 和 d > 是 char 的变量。因此，您应该将函数更改为 void add_struct(int i, char *c, char *d, double a, int y, int m, int da) ，并将字符串复制到分配的结构中:

strcpy(head->CATEGORY, c);
strcpy(head->DETAIL, d);