商城商品管理系统

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// 商城商品管理系统
#include <iostream>
#include <algorithm>
#include <string.h>
using namespace std;
#include <vector>

struct Product
{
    int id;
    char name[100];
    float price;
    int num;

    bool operator==(const Product &other) const
    {
        return id == other.id;
    }
};

vector<Product> List, Car;

void addProduct()
{
    Product New;

    printf("\n请输入新商品的id(id不可更改): ");
    scanf("%d", &New.id);

    while (count(List.begin(), List.end(), Product{New.id}))
    {
        printf("\n\a此id已经被使用!(1-重新输入/0-返回)请选择：");
        int op;
        scanf("%d", &op);
        if (op == 1)
        {
            printf("\n请输入新商品的id(id不可更改): ");
            scanf("%d", &New.id);
        }
        else if (op == 0)
        {
            printf("\n");
            return;
        }
        else
            printf("\n\a没有该选项!\n");
    }

    printf("\n输入新商品的名称: ");
    scanf("%s", New.name);
    printf("\n输入新商品的价格: ");
    scanf("%f", &New.price);
    printf("\n输入新商品的库存: ");
    scanf("%d", &New.num);

    List.push_back(New);

    printf("\n添加成功!\n\n");
}

void deleteProduct()
{
    int id;
    printf("\n输入要删除的商品id: ");
    scanf("%d", &id);

    auto it = find(List.begin(), List.end(), Product{id});
    if (it != List.end())
        List.erase(it);
    else
    {
        printf("\n\a找不到id为%d的商品!\n\n", id);
        return;
    }

    printf("\n删除成功!\n\n");
}

void printAllProducts()
{
    for (auto i : List)
    {
        printf("\n===========================================================================================\n");
        printf(" ID: %12d, 名称: %20s, 价格: %16.2f, 库存: %13d", i.id, i.name, i.price, i.num);
    }
    printf("\n===========================================================================================\n\n");
}

void deleteCarProduct()
{
    int carid, carnum;
    printf("\n请输入要删除的商品的id: ");
    scanf("%d", &carid);
    auto it = find(Car.begin(), Car.end(), Product{carid});
    int i = distance(Car.begin(), it);
    if (it != Car.end())
    {
        printf("\n请输入要删除的数量: ");
        scanf("%d", &carnum);
        if (carnum < Car[i].num)
            Car[i].num -= carnum;
        else
            Car.erase(it);
        printf("\n删除成功!\n");
    }
    else
        printf("\n\a购物车里没有id为%d的商品!\n", carid);
}

void payAll()
{
    for (auto i : Car)
    {
        auto it = find(List.begin(), List.end(), Product{i.id});
        if (it->num > i.num)
            List[distance(List.begin(), it)].num -= i.num;
        else
            List.erase(it);
    }
    Car.clear();
    printf("\n购买成功!\n");
}

void printCarProducts()
{
    int op = 1;
    while (op)
    {
        float cnt = 0;
        for (auto i : Car)
        {
            printf("\n===========================================================================================\n");
            printf(" ID: %12d, 名称: %20s, 数量: %13d, 总价：%16.2f", i.id, i.name, i.num, i.price * i.num);
            cnt += i.price * i.num;
        }
        printf("\n===========================================================================================\n");
        printf(" 总价: %20.2f                          (1-支付全部/2-清空/3-删除商品/0-返回)", cnt);
        printf("\n===========================================================================================\n");
        printf("\n请输入操作：");
        scanf("%d", &op);
        switch (op)
        {
        case 1:
            payAll();
            break;
        case 2:
            Car.clear();
            printf("\n已清除全部商品!\n");
            break;
        case 3:
            deleteCarProduct();
            break;
        case 0:
            printf("\n");
            break;
        default:
            printf("\n\a没有该选项！\n");
        }
    }
}

bool cmp(Product A, Product B)
{
    return A.id < B.id;
}

void sortPrintAll(vector<Product> A)
{
    sort(A.begin(), A.end(), cmp);

    for (auto i : A)
    {
        printf("\n===========================================================================================\n");
        printf(" ID: %12d, 名称: %20s, 价格: %16.2f, 库存: %13d", i.id, i.name, i.price, i.num);
    }
    printf("\n===========================================================================================\n\n");
}

void checkProduct(int key)
{
    int id, n;
    printf("\n输入要查询的商品的id: ");
    scanf("%d", &id);

    auto it = find(List.begin(), List.end(), Product{id});
    int i = distance(List.begin(), it);

    if (it != List.end())
    {
        printf("\n===========================================================================================\n");
        printf(" ID: %12d, 名称: %20s, 价格: %16.2f, 库存: %13d", List[i].id, List[i].name, List[i].price, List[i].num);
        printf("\n===========================================================================================\n\n");

        if (key == 1010)
        {
            printf("(n-将n件该商品加入购物车/0-返回): ");
            scanf("%d", &n);

            if (n)
            {
                Product buy{List[i].id, "", List[i].price, n};
                strcpy(buy.name, List[i].name);

                auto inCar = find(Car.begin(), Car.end(), Product{id});
                int j = distance(Car.begin(), inCar);
                if (inCar != Car.end())
                    Car[j].num += n;
                else
                    Car.push_back(buy);
                printf("\n添加成功!\n");
            }
            printf("\n");
        }
    }
    else
        printf("\n\a找不到ID为%d的商品!\n\n", id);
}

void reProduct()
{
    int id;
    printf("\n输入要修改商品的id: ");
    scanf("%d", &id);

    auto it = find(List.begin(), List.end(), Product{id});
    int i = distance(List.begin(), it);

    if (it != List.end())
    {
        int op;
        bool over = true;

        while (over)
        {
            printf("\nID: %d, 名称: %s, 价格: %.2f, 库存: %d\n\n", List[i].id, List[i].name, List[i].price, List[i].num);
            printf("要修改什么(名称-1/价格-2/库存-3/完成-0): ");
            scanf("%d", &op);

            switch (op)
            {
            case 1:
                printf("\n请输入修改后的商品名称: ");
                scanf("%s", List[i].name);
                printf("\n修改成功!\n");
                break;
            case 2:
                printf("\n请输入修改后的商品价格: ");
                scanf("%f", &List[i].price);
                printf("\n修改成功!\n");
                break;
            case 3:
                printf("\n请输入修改后的商品库存: ");
                scanf("%d", &List[i].num);
                printf("\n修改成功!\n");
                break;
            case 0:
                over = false;
                printf("\n修改完成!\n\n");
                break;
            default:
                printf("\n\a没有该选项!\n");
            }
        }
    }
    else
        printf("\n\a找不到ID为%d的商品!\n\n", id);
}

int main()
{
    List.push_back(Product{10001, "样品1", 10, 100});
    List.push_back(Product{10002, "样品2", 2.5, 2000});
    List.push_back(Product{10003, "样品3", 1024, 5});
    int key, op;
    bool login;

    while (1)
    {
        printf("登录...\n请输入身份密钥(客户-1010/商家-2020/退出系统-0): ");
        scanf("%d", &key);

        login = true;
        switch (key)
        {
        case 2020:
            printf("\n您好！商家:\n\n");

            while (login)
            {
                printf("1-添加商品\n2-删除商品\n3-显示所有商品\n4-Id升序显示所有商品\n5-查询单个商品信息\n6-修改商品信息\n0-返回登录界面\n");
                printf("请选择您要进行的操作: ");
                scanf("%d", &op);

                switch (op)
                {
                case 1:
                    addProduct();
                    break;
                case 2:
                    deleteProduct();
                    break;
                case 3:
                    printAllProducts();
                    break;
                case 4:
                    sortPrintAll(List);
                    break;
                case 5:
                    checkProduct(key);
                    break;
                case 6:
                    reProduct();
                    break;
                case 0:
                    login = false;
                    printf("\n");
                    break;
                default:
                    printf("\n\a没有该选项!\n\n");
                }
            }
            break;
        case 1010:
            printf("\n您好！客户:\n\n");

            while (login)
            {
                printf("1-显示所有商品\n2-Id升序显示所有商品\n3-查询单个商品信息\n4-查看购物车\n0-返回登录界面\n");
                printf("请选择您要进行的操作: ");
                scanf("%d", &op);

                switch (op)
                {
                case 1:
                    printAllProducts();
                    break;
                case 2:
                    sortPrintAll(List);
                    break;
                case 3:
                    checkProduct(key);
                    break;
                case 4:
                    printCarProducts();
                    break;
                case 0:
                    login = false;
                    printf("\n");
                    break;
                default:
                    printf("\n\a没有该选项!\n\n");
                }
            }
            break;
        case 0:
            exit(0);
        default:
            printf("\n\a请输入正确的密钥!\n\n");
        }
    }

    return 0;
}