c语言中“在xxxx处有未经处理的异常”问题的分析与解决

在用局部变量写了链表之后，容易出现的问题是链表头的生命期结束。笔者为了避免这个问题用了一个malloc()，结果在运行的问题就出现了如题的问题。查了下资料大致知道怎么解决这种问题了。

笔者一开始的代码是这样的：

//CREATE THE HEAD OF A LINKED LIST
Word_list* linked_list_head = (Word_list*) malloc(sizeof(Word_list));
linked_list_head->next = 0;<span style="white-space:pre">		</span>//此处

Word_list* previous;
Word_list* current;
Word_list* pointer_learn;

//START TO READ THE DATA
FILE* filepointer = fopen(filename, "rb");

Word_list* object = (Word_list*) malloc(sizeof(Word_list));
fread(&object->word, 1, sizeof(object->word), filepointer);
fread(&object->explain, 1, sizeof(object->explain), filepointer);
fread(&object->example_sentence, 1, sizeof(object->example_sentence), filepointer);
fread(&object->count_total, 1, sizeof(object->count_total), filepointer);
fread(&object->count_correct, 1, sizeof(object->count_correct), filepointer);
fread(&object->rate_correct, 1, sizeof(object->rate_correct), filepointer);
object->next = 0;

linked_list_head->next = object;<span style="white-space:pre">		</span>//和此处

然后运行就显示错误。

犹未初始化的指针变量，编译器默认将未初始化的指针初始化为0xcc,而0xcc是被保护的数据区，因此程序崩溃。

抱着试一试的态度，笔者将linked_list_head->next = 0改成了linked_list_head->next = NULL。OK，问题解决！