为什么会出现此异常错误引发未处理的异常:写入访问冲突.磁头为0xFFFFFFFFCBB1E630

Question

行头->data=(int(1，抛出上述异常-未处理的异常抛出：写入访问冲突。磁头为0xFFFFFFFFCBB1E630。原因可能是什么？

#include <stdio.h>
#include <conio.h>
void print_nodes(struct Node* head);
struct Node {
int data;
struct Node* next;
};
void print_nodes(struct Node* head) {
struct Node* current = (struct Node*)malloc(sizeof(struct Node));
while (current->next != NULL) {
printf("%d", current->data);
}
}
void main() {
struct Node* head = (struct Node*)malloc(sizeof(struct Node));
struct Node* first = (struct Node*)malloc(sizeof(struct Node));
struct Node* second = (struct Node*)malloc(sizeof(struct Node));
head->data = 1;
head->next = first;
first->data = 2;
first->next = second;
second->data = 3;
second->next = NULL;
print_nodes(head);
}

Answer 1

在print_nodes()中，不需要分配。

//struct Node* current = (struct Node*)malloc(sizeof(struct Node));
struct Node* current = head;

更好的是，从head开始，而不是从.next开始。

void print_nodes(const struct Node* current) {
while (current) {
printf("%d", current->data);
current = current->next
}
}

Answer 2

是否检查了head是否为有效指针？可能不会。

struct Node* head = (struct Node*)malloc(sizeof(struct Node));
If(0==head) return 1;
head->data = 1;