如何通过C++开发实现智能健康管理应用？

#include <iostream>
#include <fstream>
#include <string>

class User {
public:
    User(const std::string& username, const std::string& password)
        : username(username), password(password) {}

    std::string getUsername() const {
        return username;
    }

    std::string getPassword() const {
        return password;
    }

    bool saveToFile() const {
        std::ofstream file(username + ".txt");
        if (!file.is_open()) {
            return false;
        }

        file << password;
        file.close();
        return true;
    }

    static User* loadFromFile(const std::string& username) {
        std::ifstream file(username + ".txt");
        if (!file.is_open()) {
            return nullptr;
        }

        std::string password;
        file >> password;
        file.close();
        return new User(username, password);
    }

private:
    std::string username;
    std::string password;
};

int main() {
    // 用户注册
    User user("admin", "password");
    if (!user.saveToFile()) {
        std::cout << "Failed to save user to file" << std::endl;
        return 1;
    }

    // 用户登录
    std::string username, password;
    std::cout << "Username: ";
    std::cin >> username;
    std::cout << "Password: ";
    std::cin >> password;
    User* loadedUser = User::loadFromFile(username);
    if (loadedUser == nullptr || loadedUser->getPassword() != password) {
        std::cout << "Login failed" << std::endl;
        return 1;
    }

    // 用户登录成功
    std::cout << "Welcome, " << loadedUser->getUsername() << "!" << std::endl;
    delete loadedUser;

    return 0;
}

#include <iostream>
#include <string>

class HealthRecord {
public:
    HealthRecord(double height, double weight, int bloodPressure, int heartRate)
        : height(height), weight(weight), bloodPressure(bloodPressure), heartRate(heartRate) {}

    double getHeight() const {
        return height;
    }

    double getWeight() const {
        return weight;
    }

    int getBloodPressure() const {
        return bloodPressure;
    }

    int getHeartRate() const {
        return heartRate;
    }

    void setHeight(double newHeight) {
        height = newHeight;
    }

    void setWeight(double newWeight) {
        weight = newWeight;
    }

    void setBloodPressure(int newBloodPressure) {
        bloodPressure = newBloodPressure;
    }

    void setHeartRate(int newHeartRate) {
        heartRate = newHeartRate;
    }

private:
    double height;
    double weight;
    int bloodPressure;
    int heartRate;
};

int main() {
    HealthRecord record(175.0, 70.0, 120, 80);
    std::cout << "Height: " << record.getHeight() << std::endl;
    std::cout << "Weight: " << record.getWeight() << std::endl;
    std::cout << "Blood pressure: " << record.getBloodPressure() << std::endl;
    std::cout << "Heart rate: " << record.getHeartRate() << std::endl;

    record.setHeight(180.0);
    std::cout << "Updated height: " << record.getHeight() << std::endl;

    return 0;
}

#include <iostream>
#include "matplot/matplot.h"

int main() {
    std::vector<double> heights = {165, 170, 175, 180};
    std::vector<double> weights = {60, 65, 70, 75};

    // 绘制身高和体重的散点图
    auto scatter = matplot::scatter(heights, weights);
    scatter->marker_size(weights).marker(matplot::marker::circle).line_width(2);
    matplot::xlabel("Height");
    matplot::ylabel("Weight");
    matplot::show();

    return 0;
}

#include <iostream>
#include <string>

void provideHealthAdvice(double weight, int heartRate) {
    if (weight > 80) {
        std::cout << "You are overweight. Please consider losing weight." << std::endl;
    }

    if (heartRate > 100) {
        std::cout << "Your heart rate is too high. Please consult a doctor." << std::endl;
    }
}

int main() {
    double weight;
    int heartRate;
    std::cout << "Weight: ";
    std::cin >> weight;
    std::cout << "Heart rate: ";
    std::cin >> heartRate;

    provideHealthAdvice(weight, heartRate);

    return 0;
}