[英]Can't traverse through a C linked list
任務是創建一個由對象組成的鏈表。 用戶輸入main
Node
中每個Node
數據,然后將對象傳遞給push
,從而創建列表。
問題出在printList
函數中,那里的break
條件從未得到滿足。 由於某種原因, head = head->next
行什么也不做,因為每次迭代的next
地址都保持不變。
typedef struct Node {
int a;
char asd[30];
struct Node *next;
}Node;
Node *head = NULL;
void push(Node**head, struct Node* object);
void printList(Node *head);
int main() {
struct Node {
int oA;
char oAsd[30];
struct Node *next;
};
struct Node *object = malloc(sizeof(struct Node));
int c = 0;
while (1) {
printf("This int will be stored in Node %d.\n", ++c);
scanf("%d", &object->oA);
getchar();
if (!object->oA) {
break;
}
printf("This string will be stored in Node %d.\n", c);
gets_s(object->oAsd, 30);
if (!(strcmp(object->oAsd, "\0"))) {
break;
}
push(&head, object);
}
printList(head);
return 0;
}
void push(Node ** head, struct Node* object)
{
Node *tmp = malloc(sizeof(Node));
tmp = object;
tmp->next = (*head);
(*head) = tmp;
}
void printList(Node *head) {
if (head == NULL) {
puts("No list exists.");
exit(9);
}
while (1) {
printf("-------------------------------\n");
printf("|Int: <%d> |||| String: <%s>.|\n", head->a, head->asd);
printf("-------------------------------\n");
if (head->next) {
printf("\n\n%p\n\n", head->next);
head = head->next;
}
else {
break;
}
}
}`
您的代碼中有兩個主要問題:
您可以定義struct Node
都外main
和內部main
這里tmp = object;
您將一個指針的值復制到另一個指針,但您確實想將一個結構的值復制到另一個結構,即*tmp = *object;
。
除此之外-不要把head
作為全局變量。
所以代碼應該更像是:
typedef struct Node {
int a;
char asd[30];
struct Node *next;
}Node;
void push(Node**head, struct Node* object);
void printList(Node *head);
int main() {
Node *head = NULL;
struct Node *object = malloc(sizeof(struct Node));
int c = 0;
while (1) {
printf("This int will be stored in Node %d.\n", ++c);
scanf("%d", &object->a);
getchar();
if (!object->a) {
break;
}
printf("This string will be stored in Node %d.\n", c);
gets_s(object->asd, 30);
if (!(strcmp(object->asd, "\0"))) {
break;
}
push(&head, object);
}
printList(head);
return 0;
}
void push(Node ** head, struct Node* object)
{
Node *tmp = malloc(sizeof(Node));
*tmp = *object; // Copy the struct
tmp->next = (*head);
(*head) = tmp;
}
void printList(Node *head) {
if (head == NULL) {
puts("No list exists.");
exit(9);
}
while (1) {
printf("-------------------------------\n");
printf("|Int: <%d> |||| String: <%s>.|\n", head->a, head->asd);
printf("-------------------------------\n");
if (head->next) {
printf("\n\n%p\n\n", head->next);
head = head->next;
}
else {
break;
}
}
}
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