这个是原代码，运行中途报错：字符串读写出错。请大神们帮忙看看

include<stdio.h>

define M 3

include<string.h>

struct book
{
char name[30];
char author[20];
struct {
int year;
int month;
}data;
int n;
};

int main(void)
{
int i;
struct book a[M];

for (i = 0; i < 3; i++)
{
	printf("请输入第%d本书的书名:\n", i + 1);
	scanf_s("%s", a[i].name);
	printf("请输入第%d本书的作者:\n", i + 1);
	scanf_s("%s", a[i].author);
	printf("请输入第%d本书的年份:\n", i + 1);
	scanf_s("%d", &a[i].data.year);
	printf("请输入第%d本书的月份:\n", i + 1);
	scanf_s("%d", &a[i].data.month);
	printf("请输入第%d本书的库存量:\n", i + 1);
	scanf_s("%d", &a[i].n);
}

return 0;

}