link_list_ope.c

在LINUX下实现的一个超市的收银系统

#include "extern.h"
#include "struct.h"

/*========初始化链表========*/

void InitLink()
{
	head=(struct Sell *)malloc(LEN);
	p1=p2=head;
	p1->next = NULL;
}

/*========申请空间========*/
struct Sell *NewNode()
{
	struct Sell *t;
	t=(struct Sell *)malloc(LEN);
	if(t != NULL)
	{
		t->next = NULL;
	}
	return t;
}

/* Delete all Node from List exclude head*/
void FreeList(struct Sell *t)
{
	struct Sell * buf;
	buf = t;

	if(buf->next != NULL)
		FreeList(buf->next);
	free(buf);
}

/*=============把数据保存到结构体==============*/
void InputDateToStruct(char *bar_code,char *mer_name,char *mer_unit,char *mer_spec,float mer_price,int amount,float total)
{
	struct Sell *t=(struct Sell *)malloc(LEN);
	memset(t, 0, LEN);

	strncpy(t->bar_code,bar_code,strlen(bar_code));
	strncpy(t->mer_name,mer_name,strlen(mer_name));
	strncpy(t->mer_unit,mer_unit,strlen(mer_unit));
	strncpy(t->mer_spec,mer_spec,strlen(mer_spec));
	t->sell_price = mer_price;
	t->mer_amount = amount;
	t->total_money = total;
	t->next = NULL;
	
	p1=p2=head;
	while (p1->next != NULL)
	{
		p1=p2=p1->next;
	}

	p1->next = t ;
	p1=p2=t;
}

/*==============判断是否有相同的商品==========*/
struct Sell *IsTheSameMer(char *bar_code)
{
	struct Sell * buf;
	buf = head->next;

	if(buf != NULL)
	{
		do
		{
			if(!strncmp(buf->bar_code,bar_code,strlen(buf->bar_code)))
			{
				return buf;
			}
			else
			{
				buf = buf->next;
				continue;
			}
		}while (buf != NULL);
		
	}
	return 0;
}