JAVA或c的超市管理系统。

//Market.h
#ifndef	MARKET_H
#define MARKET_H
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define NUM 2
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 calculate();
void display();
struct item goods[NUM];
struct item_node * cart;
#endif


//Market.c
//#include"Market.h"
int 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("\n\n请选择数字进行操作\n");
	printf("----------------------\n");
	printf("1.建立库存信息\n");
	printf("2.显示所有商品\n");
	printf("3.购物车\n");
	printf("4.结算\n");
	printf("5.退出\n");
	printf("----------------------\n\n");
	printf("请选择对应数字 1-5:");
	while (1) {
		fflush(stdin);
		//gets(str);
		gets_s(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)) != 0l; i++) {
		printf("---------------------\n");
		printf("货号          品名  单价  库存量\n");
		printf("%7s%10s%7.2f%8d\n", goods[i].id, goods[i].brand, goods[i].out_price, goods[i].storage);
	}
	fclose(fp);
}


//establish.c
//建立库存信息文件
//#include"Market.h"
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);
		gets_s(goods[i].brand);
		printf("货号：");
		fflush(stdin);
		//gets(goods[i].id);
		gets_s(goods[i].id);
		printf("进价：");
		fflush(stdin);
		scanf("%f", &goods[i].in_price);
		printf("售价：");
		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);
}
//shoppingcart.c
//购物车
//#include"Market.h"
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("-----------------\n\n");
	printf("请选择对应数字1-4\n");
	while (1) {
		fflush(stdin);
		//gets(str);
		gets_s(str);
		select = atoi(str);
		if (select < 1 || select>3)
			printf("输入错误，请重新输入：\n");
		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("%10s%20s%7.2f%8d\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：\n");
		fflush(stdin);
		//gets(str);
		gets_s(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("已找到所需物品：\n");
				printf("--------------------------------\n");
				printf("货号           品名  单价  库存量\n");
				printf("%10s%20s%7.2f%8d\n", 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 = NULL)
			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');
}
//calculate.c
//结算
//#include "Market.h"
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++)//有个分号
		;
	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);
}

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