期末大作业基于C++实现的超市管理系统源码+exe可执行文件+详细注释.zip

#include <stdio.h> #include <stdlib.h> #include <string.h> #define NUM 5 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; int main() { printf("***********************************\n"); printf(" 欢迎进入超市管理系统\n"); printf("***********************************\n"); while (true) { switch (menu()) { case 1: establish(); break; case 2: dis_all(); break; case 3: shop_cart(); break; case 4: calculate(); break; case 5: default: printf("感谢使用，再见!\n"); break; } } return 0; } int menu() { char str[5]; int select; printf("\n\n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%8d\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("-----------------------\n\n"); 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("%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: "); 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%3.2f%4d\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 == 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); }