代码语言：javascript复制
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define NUM 5
// 来自公众号：c语言与cpp编程
struct item{
char brand[20];
char id[10];
float in_price;
float out_price;
int storage;
};
struct item_node{
struct item wanted;
int amount;
struct item_node *next;
};
int menu();
void establish();
void dis_all();
void shop_cart();
int cart_menu();
void add();
void display();
void calculate();
struct item goods[NUM];
struct item_node *cart;
void main()
{
printf("***********************************n");
printf(" 欢迎进入超市管理系统n");
printf("***********************************n");
while(1)
{
switch(menu())
{
case 1:
establish();break;
case 2:
dis_all();break;
case 3:
shop_cart();break;
case 4:
calculate();break;
case 5:
printf("感谢使用，再见!n");
exit(0);
}
}
}
int menu()
{
char str[5];
int select;
printf("nn请选择数字进行操作n");
printf("1.建立库存信息n");
printf("2.显示所有信息n");
printf("3.购物车n");
printf("4.结算n");
printf("5.退出n");
printf("请选择对应数字1--5");
while(1)
{
fflush(stdin);
gets(str);
select=atoi(str);
if(select<1||select>5)
printf("输入错误，请重新输入:");
else
break;
}
return select;
}
void dis_all()
{
int i;
FILE *fp;
fp=fopen("goods","r");
for(i=0;(fread(goods i,sizeof(struct item),1,fp))!=0;i )
{
printf("---------------------------------n");
printf("货品 品名 单价 库存量n");
printf("%s%7s%7.2f�n",goods[i].id,goods[i].brand,goods[i].out_price,goods[i].storage);
}
fclose(fp);
}
void shop_cart()
{
while(1)
{
switch(cart_menu())
{
case 1:
display();break;
case 2:
add();break;
case 3:
return;
}
}
}
int cart_menu()
{
char str[5];
int select;
printf("n请选择操作n");
printf("-----------------------n");
printf("1.显示当前购物列表n");
printf("2.添加商品n");
printf("3.退出n");
printf("-----------------------nn");
while(1)
{
fflush(stdin);
gets(str);
select=atoi(str);
if(select<1||select>3)
printf("输入错误，请重新输入:");
else
break;
}
return select;
}
void display()
{
struct item_node *p=cart;
if(p==NULL){
printf("购物车为空n");
return ;
}
while(p!=NULL){
printf("----------------------------------n");
printf("货号 品名 单价 数量n");
printf("s s%7.2f�n",p->wanted.id,p->wanted.brand,p->wanted.out_price,p->amount);
p=p->next;
}
}
void add()
{
FILE *fp;
int i,n;
char str[20];
char choice1,choice2;
struct item_node *p,*p1;
do
{
printf("输入所需物品的名称或货号: ");
fflush(stdin);
gets(str);
if((fp=fopen("goods","r"))==NULL){
printf("打开文件失败n");
continue;
}
for(i=0;fread(goods i,sizeof(struct item),1,fp)!=0;i ){
if((strcmp(goods[i].brand,str)==0||strcmp(goods[i].id,str)==0)&&goods[i].storage!=0){
printf("已经找到所需物品: n");
printf("---------------------n");
printf("货号 品名 单价 库存量n");
printf("%s%6s%3.2fMn",goods[i].id,goods[i].brand,goods[i].out_price,goods[i].storage);
printf("请输入所需数量: ");
scanf("%d",&n);
if(n>goods[i].storage){
printf("库存不足n");
break;
}
printf("n是否购买?(Y/N)");
fflush(stdin);
choice1=getchar();
if(choice1=='Y'||choice1=='y'){
p1=(struct item_node*)malloc(sizeof(struct item_node));
if(p1==NULL){
printf("内存申请失败!n");
exit(1);
}
p1->amount=n;
p1->wanted=goods[i];
p1->next=NULL;
p=cart;
if(cart==NULL)
cart=p1;
else{
while(p->next!=NULL)
p=p->next;
p1->next=p->next;
p->next=p1;
}
}
break;
}
}
if(i==NUM)
printf("未找到所需物品n");
fclose(fp);
printf("是否继续购物?(Y/N)");
fflush(stdin);
choice2=getchar();
}while(choice2=='Y'||choice2=='y');
}
void establish(){
FILE *fp;
int i;
printf("请依次输入货物信息:n");
printf("----------------------------n");
for(i=0;i<NUM;i )
{
printf("品名: ");
fflush(stdin);
gets(goods[i].brand);
printf("货号: ");
fflush(stdin);
gets(goods[i].id);
printf("进价: ");
fflush(stdin);
scanf("%f",&goods[i].in_price);
printf("哨价: ");
fflush(stdin);
scanf("%f",&goods[i].out_price);
printf("数量: ");
fflush(stdin);
scanf("%d",&goods[i].storage);
printf("n");
}
if((fp=fopen("goods","w"))==NULL){
printf("创建文件失败.n");
return;
}
fwrite(goods,sizeof(struct item),NUM,fp);
fclose(fp);
}
void calculate()
{
float total=0,pay;
struct item_node *p;
int i;
FILE *fp;
printf("以下是购物清单: n");
display();
if((fp=fopen("goods","r"))==NULL){
printf("打开文件失败: n");
return;
}
for(i=0;(fread(goods i,sizeof(struct item),1,fp))!=0;i );
fclose(fp);
p=cart;
while(p!=NULL){
total =p->wanted.out_price*p->amount;
for(i=0;strcmp(goods[i].id,p->wanted.id)!=0;i );
goods[i].storage-=p->amount;
p=p->next;
}
printf("总计 %7.2f",total);
printf("n输入实付金额: ");
scanf("%f",&pay);
printf("实付: %7.2f 找零: %7.2f",pay,pay-total);
if((fp=fopen("goods","w"))==NULL){
printf("打开文件失败.n");
return;
}
fwrite(goods,sizeof(struct item),NUM,fp);
fclose(fp);
}
