C++ ビッグ データ開発におけるデータ変換の問題にどう対処するか?

#include <iostream>
#include <string>

int main() {
    int num = 12345;
    std::string str = std::to_string(num);
    std::cout << "转换后的字符串为：" << str << std::endl;
    return 0;
}

#include <iostream>
#include <string>

int main() {
    std::string str = "3.14";
    float num = std::stof(str);
    std::cout << "转换后的浮点数为：" << num << std::endl;
    return 0;
}

#include <iostream>

struct Point2D {
    float x;
    float y;
};

struct Point3D {
    float x;
    float y;
    float z;

    // 重载转换操作符
    operator Point2D() {
        Point2D p;
        p.x = x;
        p.y = y;
        return p;
    }
};

int main() {
    Point3D p3d {1.0f, 2.0f, 3.0f};
    Point2D p2d = p3d;  // 自动调用重载的转换操作符
    std::cout << "转换后的二维点坐标为：(" << p2d.x << ", " << p2d.y << ")" << std::endl;
    return 0;
}

#include <iostream>

class Complex {
public:
    Complex(float real, float imag) : real_(real), imag_(imag) {}

    // 成员函数实现转换
    float toFloat() const {
        return real_;
    }

private:
    float real_;
    float imag_;
};

int main() {
    Complex c(3.14f, 2.718f);
    float num = c.toFloat();  // 调用成员函数实现转换
    std::cout << "转换后的浮点数为：" << num << std::endl;
    return 0;
}

#include <iostream>
#include <vector>
#include <omp.h>

void convertToUpperCase(std::vector<std::string>& strings) {
    #pragma omp parallel for
    for (int i = 0; i < strings.size(); ++i) {
        for (int j = 0; j < strings[i].size(); ++j) {
            strings[i][j] = std::toupper(strings[i][j]);
        }
    }
}

int main() {
    std::vector<std::string> strings = {"hello", "world", "c++"};
    convertToUpperCase(strings);
    for (const auto& str : strings) {
        std::cout << str << " ";
    }
    std::cout << std::endl;
    return 0;
}