代码实现：有bug，能基本实现功能，需要先存入商品，在执行其他操作。有部分注释，本人初学者，有错误请指教。
/*超市管理系统*/
/*
管理员登录密码：123456
资金管理登录密码：654321
基本能实现：
商品的添加；商品进价售价数量的修改；
满足客户的多次购物；满足客户对商品信息的查看
满足管理员对金额管理，显示盈利状况。
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "list.h"
static int numberr = 0;
//商品信息结构体
struct goods
{
int date;
int number; //商品编号
char goodsname[50]; //商品名称
int stock; //库存量
int stocknum; //进货量
double purchase; //进价
double prace; //售价
double money;//进价总金额
struct list_head slist; //内核链表使用
};
//函数声明
struct goods *new_node(int date,char *goodsname,int stock,double purchase,double prace);
struct goods *find_node(struct goods *head,int data);
void show_goods(struct goods *head);
void add(struct goods *head);
void revise(struct goods *head);
void cart(struct goods *head);
void shopping(struct goods *head);
struct goods *money(struct goods *head);
void display_fund(struct goods *head);
void display_gain(struct goods *head);
void adm();
//建立新节点，并传入参数（增加新商品，传入商品参数）
struct goods *new_node(int date,char *goodsname,int stock,double purchase,double prace)
{
numberr++;
struct goods *new = NULL;
new = malloc(sizeof(struct goods));
memset(new, 0, sizeof(struct goods));
new->date = date;
new->number = numberr;
strcpy(new->goodsname,goodsname);
new->stock = stock;
new->stocknum = new->stock;
new->purchase = purchase;
new->prace = prace;
new->money = stock*purchase;
if(new)
{
INIT_LIST_HEAD(&new->slist);
}
return new;
}
//找到新节点要插入的地方，并且插入。形成链表
struct goods *find_node(struct goods *head,int data)
{
struct goods *pos = NULL;
list_for_each_entry(pos, &head->slist,slist)
{
if(pos->number > data)
{
return pos;
}
}
return pos;
}
//管理员界面的 商品信息全部显示
void show_goods(struct goods *head)
{
struct goods *pos = head;
if(list_empty(&pos->slist))
{
printf("库存中没有商品，请先进货。\n");
printf("\n");
}
else
{
list_for_each_entry(pos,&head->slist,slist)
{
printf("进货日期：%d\n",pos->date);
printf("编号： %d\n",pos->number);
printf("商品名称： %s\n",pos->goodsname);
printf("库存： %d\n",pos->stock);
printf("进价： %.2lf元\n",pos->purchase);
printf("售价： %.2lf元\n",pos->prace);
printf("\n");
}
}
}
/*管理员模式下 增加商品*/
void add(struct goods *head)
{
int date;
int n;
char goodsname[50];
int stock;
double purchase;
double prace;
while(1)
{
printf("请输入进货日期：\n");
scanf("%d",&date);
printf("请输入商品名称：\n");
scanf("%s",goodsname);
printf("请输入商品进货数量：\n");
scanf("%d",&stock);
printf("请输入商品进价：\n");
scanf("%lf",&purchase);
printf("请输入商品售价：\n");
scanf("%lf",&prace);
struct goods *new = new_node(date,goodsname,stock,purchase,prace);
struct goods *pos = find_node(head,numberr);
list_add_tail(&new->slist,&pos->slist);
printf("你好：管理员大大。\n你是确定继续新增（1）：\n还是返回上一层呢（0）：\n");
scanf("%d",&n);
if(n == 1)
{
continue;
}
break;
}
}
//管理员模式下的 商品信息修改。
void revise(struct goods *head)
{
int number = 0;
int n = 0;
int sto ;
double purc;
double pra;
printf("请输入你需要修改的商品的编号：\n");
scanf("%d",&number);
printf("请选择你所需要修改的商品信息：\n库存信息（0）\n进价信息（1）\n售价信息（2）\n");
scanf("%d",&n);
int flag = 0;
struct goods *pos = head;
list_for_each_entry(pos, &head->slist,slist)
{
if(pos->number = number)
{
switch(n)
{
case 0:
printf("请输入新的库存量：\n");
scanf("%d",&sto);
pos->stock = sto;
flag = 1;
break;
case 1:
printf("请输入新的进价：\n");
scanf("%lf",&purc);
pos->purchase = purc;
flag = 1;
break;
case 2:
printf("请输入新的售价：\n");
scanf("%lf",&pra);
pos->prace = pra;
flag = 1;
break;
}
}
if(flag)
break;
}
}
//顾客查看商品。
void cart(struct goods *head)
{
printf("===========================你好，欢迎进入购物车================================\n");
printf("\n");
int choice;
struct goods *pos = head;
if(list_empty(&pos->slist))
{
printf("库存中没有任何商品，请联系管理员进货。\n");
printf("\n");
}
else
{
printf("你好，超市中拥有以下商品：\n");
list_for_each_entry(pos,&head->slist,slist)
{
if(pos->stock == 0)
{
printf("%s 已经售罄。\n",pos->goodsname);
}
else
{
printf("编号为（%d）\n商品名称：%s:剩余 %d 件 单价%0.2lf元\n\n",pos->number,pos->goodsname,pos->stock,pos->prace);
}
}
while(1)
{
printf("你好：请问你是需要继续购物（1），退出（0）：\n");
scanf("%d",&choice);
if(choice == 1)
{
shopping(head);
}
break;
}
}
}
//顾客进行购物
void shopping(struct goods *head)
{
double mone = 0;
while(1)
{
int num = 0;
double tem = 0;
printf("请输入商品编号：\n");
scanf("%d",&num);
struct goods *pos = head;
list_for_each_entry(pos,&head->slist,slist)
{
if(pos->number == num)
{
int amount = 0;
printf("请输入你所需要购买的数量：\n");
scanf("%d",&amount);
if(pos->stock >= amount)
{
tem = amount * (pos->prace) ;
pos->stock = pos->stock - amount;
}
else
{
printf("抱歉，你所需要的商品数量不足。\n");
}
}
}
printf("你本次购买商品花费 %0.2lf 元。\n",tem);
mone = mone + tem;
int choice;
printf("请问你是需要继续购买（1） 还是买完离开呢？（0）\n");
scanf("%d",&choice);
if(choice == 0)
{
printf("你本次总共花费%0.2lf元\n",mone);
break;
}
}
}
//金额管理系统，显示所有金额信息 /*在顾客每次购买东西后盈利金额计算*/
struct goods *money(struct goods *head)
{
int password = 654321;
int sign;
printf("请输入密码以进入资金管理系统：\n");
scanf("%d",&sign);
if( password == sign )
{
while(1)
{
int choice;
printf("请选择你需要进入的部分：剩余本金显示（1）盈利显示（2）退出（0）\n");
scanf("%d",&choice);
switch(choice)
{
case 1:
display_fund(head);break;
case 2:
display_gain(head);break;
default:
break;
}
while( choice == 0);
break;
}
}
}
void display_fund(struct goods *head)
{
double corpus = 0;
double fund = 0;
double total = 0;
struct goods *pos = head;
printf("请输入你的资金总额：\n");
scanf("%lf",&corpus);
list_for_each_entry(pos,&head->slist,slist)
{
fund = (pos->stocknum)*(pos->purchase);
total += fund;
}
printf("你进货一共花费：%0.2lf元\n",total);
printf("你剩余本金为：%0.2lf元\n",corpus - total);
}
void display_gain(struct goods *head)
{
double fund = 0;
struct goods *pos = head;
list_for_each_entry(pos,&head->slist,slist)
{
double univalent = 0;
double totap = 0;
if((pos->stocknum) > (pos->stock))
{
univalent = (pos->prace) - (pos->purchase);
totap = univalent * ((pos->stocknum) - (pos->stock));
}
printf("该商品总共盈利%0.2lf元\n",totap);
fund += totap;
}
printf("当前商品总盈利为%0.2lf元。\n",fund);
}
//选择用户身份：顾客或者管理员
void adm()
{
int choice;
int n;
int cipher = 123456;
int password;
struct goods *head = NULL;
head = malloc(sizeof(struct goods));
if(head)
{
INIT_LIST_HEAD(&head->slist);
}
while(1)
{
printf("你好：请问你是需要顾客服务 1 ：\n管理界面 0 :\n");
scanf("%d",&n);
if(n == 0)
{
printf("请输入超市管理系统密码：\n");
scanf("%d",&password);
if(cipher == password)
{
printf("============================你好：管理员大大=============================\n");
printf("请问你是需要那些服务：\n（0）查看商品全部信息：\n（1）增加商品：\n（2）修改商品信息：\n（3）金额管理：\n");
scanf("%d",&choice);
switch(choice)
{
case 0:
show_goods(head);break;
case 1:
add(head);break;
case 2:
revise(head);break;
case 3:
money(head);break;
default:
break;
}
}
else
{
printf("你输入的密码有误，请重新输入。\n");
}
continue;
}
else
{
printf("\n");
cart(head);
}
}
}
int main(void)
{
adm();
return 0;
}