酒店管理系统 c语言链表

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define MaxSize 20
typedef struct guest_info
{
	char name[20];
	int sum;
	char time[10];
	int number;
	struct guest_info *next;
}Guest ,*Pointer;
void Insert(Pointer *Head);
void Search(Pointer Head);
void Update(Pointer Head);
void Delete(Pointer *Head);
void Show(Pointer Head);
int main() 
{
	Pointer Head=NULL;
	int i;
	do
	{
		printf(\"\\n\");
		printf(\"1---插入\\n\");
		printf(\"2---查询\\n\");
		printf(\"3---修改\\n\");
		printf(\"4---删除\\n\");
		printf(\"5---显示\\n\");
		printf(\"6---退出\\n\");
		scanf(\"%d\",&i);
		switch(i)
		{
			case 1:Insert(&Head);break;
			case 2:Search(Head);break;
			case 3:Update(Head);break;
			case 4:Delete(&Head);break;
			case 5:Show(Head);break;
			case 6:break;
			default:printf(\"重新输入\");break;
		}
	}while(i!=6);
	return 0;
}
void Insert(Pointer *Head)
{
	int in_number;
	Pointer p,q,r;
	printf(\"请输入编号:\");
	scanf(\"%d\",&in_number);
	p=q=*Head;
	while(p!=NULL)
	{
		if(p->number==in_number)
		 {
		 	printf(\"已经有相同编号\");
			return; 
		 }
		else
		 {
		 	q=p;p=p->next;
		 }
    }
    r=(Pointer)malloc(sizeof(Guest ));
    r->next=NULL;
    if(r==NULL)
     {
     	printf(\"error\");
		return;
	 }
	if(q==NULL)
	 *Head=r;
	else
	 {
	 	q->next=r;
	 }
	r->number=in_number;
	printf(\"姓名 人数 用餐时间\\n\");
	scanf(\"%s%d%s\",r->name,&r->sum,r->time);
}
void Search(Pointer Head)
{
	int flag=1,number;
	Pointer p;
	printf(\"请输入编号:\");
	scanf(\"%d\",&number);
	p=Head;
	while(p!=NULL&&flag)
	{
		if(p->number==number)
		{
			printf(\"姓名:%s \\n人数:%d \\n用餐时间:%s\\n\",p->name,p->sum,p->time);
			flag=0;
		}
		else
		 p=p->next;
	}
	if(flag)
	printf(\"no data\");
}
void Update(Pointer Head)
{
	int flag=1,number;
	Pointer p;
	printf(\"请输入编号:\");
	scanf(\"%d\",&number);
	p=Head;
	while(p!=NULL&&flag)
	{
		if(p->number==number)
		{
			printf(\"人数 用餐时间\\n\");
			scanf(\"%d%s\",&p->sum,p->time);
			flag=0;
		}
		else
		p=p->next;
	}
	if(flag)
	printf(\"no data\"); 
}
void Delete(Pointer *Head)
{
	int flag=1,number;
	Pointer p,q;
	printf(\"请输入编号:\");
	scanf(\"%d\",&number);
	p=q=*Head;
	while(p!=NULL&&flag)
	{
		if(p->number==number)
		{
			if(p==*Head)
			{
				*Head=p->next;
				free(p);
			}
			else
			{
				q->next=p->next;
				free(p);
			}
			flag=0;
		}
		else
		{
			q=p;
			p=p->next;
		}
	}
	if(flag)
	printf(\"no data\");
}
void Show(Pointer Head)
{
	Pointer p;
	p=Head;
	while(p!=NULL)
	{
		printf(\"编号:%d  姓名:%s  人数:%d  用餐时间:%s\\n\",p->number,p->name,p->sum,p->time);
		p=p->next;
	}
}