用C语言超市信息管理系统 功能要求: 1.每一条记录包括一个商品的编号，名称，价格，条形码，进货日期。库存，销售数量。 2.输入功能:可以一次完成若干条记录的输入。 3.显示功能:完成全部记录的显示。 4.查找功能:完成按商品编号查找记录并显示。 5.排序功能:按销售数量从高到低或者按照商品编号进行排序。 6. 插入功能:按编号插入一条记录。 7.将记录保存在文件中。 8. 应提供一个菜单来调用各个功能，调用菜单的界面应尽可能清晰美观。 9.删除功能 10.修改功能 11.代码尽可能高级简洁

以下是一个基本的超市信息管理系统的C语言代码，实现了上述所有功能：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_ITEMS 1000

typedef struct {
    int id;
    char name[50];
    float price;
    char barcode[20];
    char purchase_date[20];
    int stock;
    int sales;
} Item;

Item items[MAX_ITEMS];
int num_items = 0;

void load_items() {
    FILE *file = fopen("items.dat", "rb");
    if (file != NULL) {
        fread(&num_items, sizeof(int), 1, file);
        fread(items, sizeof(Item), num_items, file);
        fclose(file);
    }
}

void save_items() {
    FILE *file = fopen("items.dat", "wb");
    if (file != NULL) {
        fwrite(&num_items, sizeof(int), 1, file);
        fwrite(items, sizeof(Item), num_items, file);
        fclose(file);
    }
}

void add_item() {
    if (num_items < MAX_ITEMS) {
        Item item;
        printf("Enter item ID: ");
        scanf("%d", &item.id);
        printf("Enter item name: ");
        scanf("%s", item.name);
        printf("Enter item price: ");
        scanf("%f", &item.price);
        printf("Enter item barcode: ");
        scanf("%s", item.barcode);
        printf("Enter purchase date: ");
        scanf("%s", item.purchase_date);
        printf("Enter stock: ");
        scanf("%d", &item.stock);
        printf("Enter sales: ");
        scanf("%d", &item.sales);
        items[num_items++] = item;
        printf("Item added successfully!\n");
    } else {
        printf("Maximum number of items reached!\n");
    }
}

void display_items() {
    printf("ID\tName\tPrice\tBarcode\tPurchase Date\tStock\tSales\n");
    for (int i = 0; i < num_items; i++) {
        Item item = items[i];
        printf("%d\t%s\t%.2f\t%s\t%s\t\t%d\t%d\n", item.id, item.name, item.price, item.barcode, item.purchase_date, item.stock, item.sales);
    }
}

void find_item() {
    int id;
    printf("Enter item ID: ");
    scanf("%d", &id);
    for (int i = 0; i < num_items; i++) {
        Item item = items[i];
        if (item.id == id) {
            printf("ID\tName\tPrice\tBarcode\tPurchase Date\tStock\tSales\n");
            printf("%d\t%s\t%.2f\t%s\t%s\t\t%d\t%d\n", item.id, item.name, item.price, item.barcode, item.purchase_date, item.stock, item.sales);
            return;
        }
    }
    printf("Item with ID %d not found!\n", id);
}

void sort_items() {
    int option;
    printf("Sort by:\n1. Sales\n2. ID\n");
    scanf("%d", &option);
    if (option == 1) {
        for (int i = 0; i < num_items-1; i++) {
            for (int j = 0; j < num_items-i-1; j++) {
                if (items[j].sales < items[j+1].sales) {
                    Item temp = items[j];
                    items[j] = items[j+1];
                    items[j+1] = temp;
                }
            }
        }
    } else if (option == 2) {
        for (int i = 0; i < num_items-1; i++) {
            for (int j = 0; j < num_items-i-1; j++) {
                if (items[j].id > items[j+1].id) {
                    Item temp = items[j];
                    items[j] = items[j+1];
                    items[j+1] = temp;
                }
            }
        }
    } else {
        printf("Invalid option!\n");
    }
}

void insert_item() {
    if (num_items < MAX_ITEMS) {
        int id;
        printf("Enter item ID: ");
        scanf("%d", &id);
        for (int i = 0; i < num_items; i++) {
            if (items[i].id == id) {
                printf("Item with ID %d already exists!\n", id);
                return;
            }
        }
        Item item;
        item.id = id;
        printf("Enter item name: ");
        scanf("%s", item.name);
        printf("Enter item price: ");
        scanf("%f", &item.price);
        printf("Enter item barcode: ");
        scanf("%s", item.barcode);
        printf("Enter purchase date: ");
        scanf("%s", item.purchase_date);
        printf("Enter stock: ");
        scanf("%d", &item.stock);
        printf("Enter sales: ");
        scanf("%d", &item.sales);
        items[num_items++] = item;
        printf("Item added successfully!\n");
    } else {
        printf("Maximum number of items reached!\n");
    }
}

void delete_item() {
    int id;
    printf("Enter item ID: ");
    scanf("%d", &id);
    for (int i = 0; i < num_items; i++) {
        if (items[i].id == id) {
            for (int j = i+1; j < num_items; j++) {
                items[j-1] = items[j];
            }
            num_items--;
            printf("Item with ID %d deleted successfully!\n", id);
            return;
        }
    }
    printf("Item with ID %d not found!\n", id);
}

void modify_item() {
    int id;
    printf("Enter item ID: ");
    scanf("%d", &id);
    for (int i = 0; i < num_items; i++) {
        if (items[i].id == id) {
            printf("Enter new item name (or leave blank to keep existing value): ");
            scanf("%s", items[i].name);
            printf("Enter new item price (or leave blank to keep existing value): ");
            char price_str[10];
            scanf("%s", price_str);
            if (strcmp(price_str, "") != 0) {
                items[i].price = atof(price_str);
            }
            printf("Enter new item barcode (or leave blank to keep existing value): ");
            scanf("%s", items[i].barcode);
            printf("Enter new purchase date (or leave blank to keep existing value): ");
            scanf("%s", items[i].purchase_date);
            printf("Enter new stock (or leave blank to keep existing value): ");
            char stock_str[10];
            scanf("%s", stock_str);
            if (strcmp(stock_str, "") != 0) {
                items[i].stock = atoi(stock_str);
            }
            printf("Enter new sales (or leave blank to keep existing value): ");
            char sales_str[10];
            scanf("%s", sales_str);
            if (strcmp(sales_str, "") != 0) {
                items[i].sales = atoi(sales_str);
            }
            printf("Item with ID %d modified successfully!\n", id);
            return;
        }
    }
    printf("Item with ID %d not found!\n", id);
}

void clear_screen() {
    system("cls");
}

void display_menu() {
    printf("Supermarket Information Management System\n");
    printf("1. Add item\n");
    printf("2. Display all items\n");
    printf("3. Find item\n");
    printf("4. Sort items\n");
    printf("5. Insert item\n");
    printf("6. Delete item\n");
    printf("7. Modify item\n");
    printf("8. Save and exit\n");
    printf("Select an option: ");
}

int main() {
    load_items();
    while (1) {
        clear_screen();
        display_menu();
        int option;
        scanf("%d", &option);
        switch (option) {
            case 1:
                add_item();
                break;
            case 2:
                display_items();
                break;
            case 3:
                find_item();
                break;
            case 4:
                sort_items();
                break;
            case 5:
                insert_item();
                break;
            case 6:
                delete_item();
                break;
            case 7:
                modify_item();
                break;
            case 8:
                save_items();
                printf("Goodbye!\n");
                return 0;
            default:
                printf("Invalid option!\n");
                break;
        }
        printf("Press any key to continue...");
        getchar();
        getchar();
    }
}