C使用函數將字符串值分配給結構中的字符串元素

Question

我需要爲結構中的元素分配字符串（字符大小[255]）。該結構是這樣的：

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

，我有一些代碼從一個文本文件中獲取值，並將其設置爲可變的，我再傳給add_struct功能看起來像這樣：

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; 
    } 
} 

我收到錯誤消息：

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

如何正確地將這些值分配給元素CATEGORY和DETAIL？

Answer 1

struct的CATEGORY和DETAIL字段被定義爲255個字符陣列，而c和d是char變量。所以，你應該功能更改爲void add_struct(int i, char *c, char *d, double a, int y, int m, int da)和字符串複製到分配結構：

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