银行排队问题

这道c语言练习题折磨了我好久好久，改了好几次，最终结果勉强觉得还能接受。

 附上代码

#include
#include
#include
typedef struct customer
{
	char ID[11];
	struct customer* next; 
}cus;
cus* creatlist()
{
	cus* headnode = (cus*)malloc(sizeof(cus));
	headnode->next =NULL;
	return headnode;
}
cus* createnode(char data[11])
{
	cus* newnode = (cus*)malloc(sizeof(cus));
	int i=0;
	while(data[i])
	{
		newnode->ID[i]=data[i];
		i++;
	}
	newnode->ID[i]='';
	newnode->next = NULL;
	return newnode;
}
void addID(cus* list)
{
	printf("请输入客户IDn");
	char data[11]; 
	gets(data);
	cus* newnode = createnode(data);
	cus* backfrontnode=list;
	cus* backnode=backfrontnode->next;
	while(backnode) 
	{
		backnode=backnode->next;
		backfrontnode=backfrontnode->next;
	}
	newnode->next=backnode;
	backfrontnode->next=newnode;
}
void printlist(cus* list)
{
	cus* pmove=list->next;
	int i=1;
	while(pmove)
	{
		printf("%d.t%sn",i,pmove->ID);
		i++;
		pmove=pmove->next;
	}
	putchar('n');
}
int main()
{
	char n='a';
	cus* list = creatlist();
	do
	{
		system("cls");
		addID(list);
		fflush(stdin);
		printf("输入0退出，回车键继续n"); 
		n=getchar();
		fflush(stdin);
	}while(n!='0');
	system("cls");
	printf("正在排队的客户有：nn");
	printlist(list);
	return 0;
 }