使用c++编写程序：药品管理系统实现1添加模块2删除模块3查询模块4修改模块5浏览模块6排序模块7退出模块

好的，下面是一个简单的药品管理系统的C++代码，实现了以下功能：

1. 添加药品信息
2. 删除药品信息
3. 查询药品信息
4. 修改药品信息
5. 浏览药品信息
6. 排序药品信息
7. 保存并退出

代码如下：

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

struct Drug {
    string name;
    string type;
    string production_date;
    string expiration_date;
    float price;
    int quantity;
};

vector<Drug> drugs;

void addDrug() {
    Drug drug;
    cout << "请输入药品名称：";
    cin >> drug.name;
    cout << "请输入药品类型：";
    cin >> drug.type;
    cout << "请输入生产日期：";
    cin >> drug.production_date;
    cout << "请输入保质期：";
    cin >> drug.expiration_date;
    cout << "请输入单价：";
    cin >> drug.price;
    cout << "请输入数量：";
    cin >> drug.quantity;
    drugs.push_back(drug);
    cout << "添加成功！" << endl;
}

void deleteDrug() {
    string name;
    cout << "请输入要删除的药品名称：";
    cin >> name;
    for (int i = 0; i < drugs.size(); i++) {
        if (drugs[i].name == name) {
            drugs.erase(drugs.begin() + i);
            cout << "删除成功！" << endl;
            return;
        }
    }
    cout << "没有找到该药品！" << endl;
}

void queryDrug() {
    string name;
    cout << "请输入要查询的药品名称：";
    cin >> name;
    for (int i = 0; i < drugs.size(); i++) {
        if (drugs[i].name == name) {
            cout << "药品名称：" << drugs[i].name << endl;
            cout << "药品类型：" << drugs[i].type << endl;
            cout << "生产日期：" << drugs[i].production_date << endl;
            cout << "保质期：" << drugs[i].expiration_date << endl;
            cout << "单价：" << drugs[i].price << endl;
            cout << "数量：" << drugs[i].quantity << endl;
            return;
        }
    }
    cout << "没有找到该药品！" << endl;
}

void modifyDrug() {
    string name;
    cout << "请输入要修改的药品名称：";
    cin >> name;
    for (int i = 0; i < drugs.size(); i++) {
        if (drugs[i].name == name) {
            cout << "请输入新的药品名称：";
            cin >> drugs[i].name;
            cout << "请输入新的药品类型：";
            cin >> drugs[i].type;
            cout << "请输入新的生产日期：";
            cin >> drugs[i].production_date;
            cout << "请输入新的保质期：";
            cin >> drugs[i].expiration_date;
            cout << "请输入新的单价：";
            cin >> drugs[i].price;
            cout << "请输入新的数量：";
            cin >> drugs[i].quantity;
            cout << "修改成功！" << endl;
            return;
        }
    }
    cout << "没有找到该药品！" << endl;
}

void browseDrug() {
    for (int i = 0; i < drugs.size(); i++) {
        cout << "药品名称：" << drugs[i].name << endl;
        cout << "药品类型：" << drugs[i].type << endl;
        cout << "生产日期：" << drugs[i].production_date << endl;
        cout << "保质期：" << drugs[i].expiration_date << endl;
        cout << "单价：" << drugs[i].price << endl;
        cout << "数量：" << drugs[i].quantity << endl;
        cout << endl;
    }
}

void sortDrug() {
    int choice;
    cout << "请选择排序方式：" << endl;
    cout << "1.按药品名称排序" << endl;
    cout << "2.按药品类型排序" << endl;
    cout << "3.按生产日期排序" << endl;
    cout << "4.按保质期排序" << endl;
    cout << "5.按单价排序" << endl;
    cout << "6.按数量排序" << endl;
    cin >> choice;
    switch (choice) {
        case 1:
            sort(drugs.begin(), drugs.end(), [](Drug a, Drug b) {
                return a.name < b.name;
            });
            break;
        case 2:
            sort(drugs.begin(), drugs.end(), [](Drug a, Drug b) {
                return a.type < b.type;
            });
            break;
        case 3:
            sort(drugs.begin(), drugs.end(), [](Drug a, Drug b) {
                return a.production_date < b.production_date;
            });
            break;
        case 4:
            sort(drugs.begin(), drugs.end(), [](Drug a, Drug b) {
                return a.expiration_date < b.expiration_date;
            });
            break;
        case 5:
            sort(drugs.begin(), drugs.end(), [](Drug a, Drug b) {
                return a.price < b.price;
            });
            break;
        case 6:
            sort(drugs.begin(), drugs.end(), [](Drug a, Drug b) {
                return a.quantity < b.quantity;
            });
            break;
        default:
            cout << "选择无效！" << endl;
            return;
    }
    cout << "排序成功！" << endl;
}

void saveAndExit() {
    ofstream outfile("drugs.txt");
    for (int i = 0; i < drugs.size(); i++) {
        outfile << drugs[i].name << " " << drugs[i].type << " " << drugs[i].production_date << " "
                << drugs[i].expiration_date << " " << drugs[i].price << " " << drugs[i].quantity << endl;
    }
    outfile.close();
    cout << "保存成功！" << endl;
    exit(0);
}

void loadDrugs() {
    ifstream infile("drugs.txt");
    while (true) {
        Drug drug;
        infile >> drug.name >> drug.type >> drug.production_date >> drug.expiration_date >> drug.price >> drug.quantity;
        if (infile.eof()) {
            break;
        }
        drugs.push_back(drug);
    }
    infile.close();
}

int main() {
    loadDrugs();
    while (true) {
        int choice;
        cout << "请选择操作：" << endl;
        cout << "1.添加药品信息" << endl;
        cout << "2.删除药品信息" << endl;
        cout << "3.查询药品信息" << endl;
        cout << "4.修改药品信息" << endl;
        cout << "5.浏览药品信息" << endl;
        cout << "6.排序药品信息" << endl;
        cout << "7.保存并退出" << endl;
        cin >> choice;
        switch (choice) {
            case 1:
                addDrug();
                break;
            case 2:
                deleteDrug();
                break;
            case 3:
                queryDrug();
                break;
            case 4:
                modifyDrug();
                break;
            case 5:
                browseDrug();
                break;
            case 6:
                sortDrug();
                break;
            case 7:
                saveAndExit();
                break;
            default:
                cout << "选择无效！" << endl;
                break;
        }
    }
    return 0;
}

在这个程序中，药品信息被存储在一个 `vector` 中，其中每个元素都是一个 `Drug` 结构体，包含药品的名称、类型、生产日期、保质期、单价和数量等信息。

程序在开始时会从文件 `drugs.txt` 中加载药品信息，用户可以进行添加、删除、查询、修改、浏览、排序等操作。用户在退出前可以选择保存数据，程序将把药品信息保存到文件 `drugs.txt` 中。