C语言中的链表
我还是C语言的新手,我遇到了一个大问题。。。 首先,我想向您展示我在列表中插入项目的代码:C语言中的链表,c,linked-list,C,Linked List,我还是C语言的新手,我遇到了一个大问题。。。 首先,我想向您展示我在列表中插入项目的代码: void input_books_info(int number_of_books, BOOK *current) { int i; for(i = 0; i < number_of_books; i++) { while(current->next != NULL) current = current->next;
void input_books_info(int number_of_books, BOOK *current)
{
int i;
for(i = 0; i < number_of_books; i++)
{
while(current->next != NULL)
current = current->next;
current->next = (BOOK *)malloc(sizeof(BOOK));
printf_s("%d book catalog number: ", i + 1);
scanf_s("%s", ¤t->next->catalog_number , 20);
printf_s("%d book title: ", i + 1);
scanf_s("%s", current->next->title ,80);
printf_s("%d book author: ", i + 1);
scanf_s("%s", current->next->author ,40);
printf_s("%d book publisher: ", i+1);
scanf_s("%s", current->next->publisher,80);
printf_s("%d book price: ", i + 1);
scanf_s("%f", ¤t->next->price, 5);
printf_s("%d book year published: ", i + 1);
scanf_s("%d", ¤t->next->year_published, 5);
current->next->next = NULL;
printf_s("\n\n");
}
}
最后可能是打印功能的问题:
void main (void)
{
int number_of_books, t = 1;
char book_catalog_number[STRMAX];
char book_title[STRMAX];
char book_author[STRMAX];
char reading_file[STRMAX];
char saving_file[STRMAX];
first = malloc(sizeof(BOOK));
first->next = NULL;
/*
printf_s("Enter file name: "); gets(saving_file);
first->next = book_open(first, saving_file);
*/
while(t)
{
char m;
printf_s("1. Input \n0. Exit \n\n");
printf_s("Choose operation: ");
m = getch();
switch(m)
{
case '1':
printf_s("\ninput number of books: ");
scanf_s("%d", &number_of_books);
input_books_info(number_of_books, first);
printf_s("\n");
break;
default:
printf_s("\nNo entry found!\n\n\n\n\n");
break;
}
}
}
void print_books_info(BOOK *current)
{
while(current->next != NULL && current != NULL)
{
printf_s("%s, ", current->next->catalog_number);
printf_s("%s, ", current->author);
printf_s("%s, ", current->next->title);
printf_s("%s, ", current->next->author);
printf_s("%s, ", current->next->publisher);
printf_s("%.2f, ", current->next->price);
printf_s("%d", current->next->year_published);
printf_s("\n\n");
current = current->next;
}
}
我的问题是,当我运行应用程序时,程序运行得很好。但当我启动应用程序时,程序只存储第一次输入的数据,第二次和第三次数据丢失。。。你能帮我弄明白吗 我怀疑是扫描程序读取了比预期更多的字段。相反,使用单个scanf_s将整行读取到缓冲区中,然后使用sscanf_s解析缓冲区 另外,由于你们并没有展示书的声明,我们都有点盲目地拍摄,但书中的元素尺寸是否正确?如果不是,则在读取期间会有元素覆盖。这本书应该是这样的:
class BOOK {
BOOK *next;
char catalog_number [20]; // at least 20 chars
char title [80];
char author [40];
char publisher [80];
double price;
int year_published;
};
在print_books_info中,您应该在while条件下选中
current
之前的current->next
。您可以发布您用于书本的结构吗?问题是如何表现出来的?换句话说,你怎么知道第二本和第三本书“不见了”?“失踪”是什么意思?你能告诉我们你是如何给我们打电话的吗?print\u books\u info
。如果我删除所有scanf并用cin(仅限C++)替换它们,您的代码就可以正常工作。我还建议使用getchar()而不是getch()。