用c++做一个个人消费管理系统

好的，一个个人消费管理系统可以分为以下几个模块：

1. 用户登录/注册模块：用户可以通过输入用户名和密码登录系统，或者通过注册新用户账号。

2. 添加消费记录模块：用户可以添加一条新的消费记录，包括消费金额、消费日期、消费类别等信息。

3. 消费记录查询模块：用户可以根据时间、类别等条件查询历史的消费记录。

4. 消费报表模块：系统可以根据用户的消费记录生成消费报表，包括消费总额、各类别消费占比等。

下面是一个简单的示例代码，供您参考：

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

using namespace std;

// 消费记录结构体
struct ExpenseRecord {
    int id;
    string category;
    double amount;
    time_t date;
};

// 消费管理系统类
class ExpenseManager {
private:
    string username;
    string password;
    vector<ExpenseRecord> records;
public:
    ExpenseManager(string username, string password) {
        this->username = username;
        this->password = password;
    }

    // 用户登录函数
    bool login(string username, string password) {
        return (this->username == username && this->password == password);
    }

    // 用户注册函数
    void registerUser(string username, string password) {
        this->username = username;
        this->password = password;
    }

    // 添加消费记录函数
    void addRecord(string category, double amount) {
        ExpenseRecord record;
        record.id = records.size() + 1;
        record.category = category;
        record.amount = amount;
        record.date = time(NULL);
        records.push_back(record);
    }

    // 查询消费记录函数
    vector<ExpenseRecord> getRecords(time_t start, time_t end, string category) {
        vector<ExpenseRecord> result;
        for (int i = 0; i < records.size(); i++) {
            ExpenseRecord record = records[i];
            if ((start == -1 || record.date >= start) &&
                (end == -1 || record.date <= end) &&
                (category.empty() || record.category == category)) {
                result.push_back(record);
            }
        }
        return result;
    }

    // 生成消费报表函数
    void generateReport() {
        double total = 0;
        vector<string> categories;
        vector<double> amounts;

        for (int i = 0; i < records.size(); i++) {
            ExpenseRecord record = records[i];
            total += record.amount;
            bool found = false;
            for (int j = 0; j < categories.size(); j++) {
                if (categories[j] == record.category) {
                    amounts[j] += record.amount;
                    found = true;
                    break;
                }
            }
            if (!found) {
                categories.push_back(record.category);
                amounts.push_back(record.amount);
            }
        }

        cout << "----- 消费报表 -----" << endl;
        cout << "总消费金额：" << total << endl;
        for (int i = 0; i < categories.size(); i++) {
            double percentage = amounts[i] / total * 100;
            cout << categories[i] << "：" << amounts[i] << "，占比：" << percentage << "%" << endl;
        }
    }

    // 保存消费记录到文件函数
    void saveToFile(string filename) {
        ofstream fout(filename);
        for (int i = 0; i < records.size(); i++) {
            ExpenseRecord record = records[i];
            fout << record.id << "," << record.category << "," << record.amount << "," << record.date << endl;
        }
        fout.close();
    }

    // 从文件中加载消费记录函数
    void loadFromFile(string filename) {
        ifstream fin(filename);
        string line;
        while (getline(fin, line)) {
            ExpenseRecord record;
            sscanf(line.c_str(), "%d,%[^,],%lf,%ld", &record.id, record.category.c_str(), &record.amount, &record.date);
            records.push_back(record);
        }
        fin.close();
    }
};

// 测试代码
int main() {
    ExpenseManager manager("admin", "123456");
    if (manager.login("admin", "123456")) {
        cout << "登录成功！" << endl;
    }
    manager.addRecord("餐饮", 100);
    manager.addRecord("购物", 200);
    manager.addRecord("餐饮", 50);
    manager.addRecord("交通", 30);
    vector<ExpenseRecord> records = manager.getRecords(-1, -1, "餐饮");
    cout << "查询结果：" << endl;
    for (int i = 0; i < records.size(); i++) {
        ExpenseRecord record = records[i];
        cout << record.id << " " << record.category << " " << record.amount << " " << record.date << endl;
    }
    manager.generateReport();
    manager.saveToFile("expenses.txt");
    manager.loadFromFile("expenses.txt");
    return 0;
}

以上代码仅供参考，具体实现方式可以根据您的需求进行修改和完善。