①.利用new和delete实现一个二维数组，存放浮点数，实现矩阵的加法运算，并输出数据； ②.构造一个struct结构 struct student{ int num, string name, char sex };要求使用new和delete操作该struct,并输出数据。

①. 实现一个二维数组和矩阵加法运算：

#include <iostream>

// 定义一个二维浮点数数组
class Matrix {
public:
    int rows, cols;
    float** data;

    // 构造函数，分配内存
    Matrix(int r, int c) : rows(r), cols(c) {
        data = new float*[rows];
        for (int i = 0; i < rows; ++i)
            data[i] = new float[cols];
    }

    // 析构函数，释放内存
    ~Matrix() {
        for (int i = 0; i < rows; ++i)
            delete[] data[i];
        delete[] data;
    }

    // 加法运算
    void add(Matrix& other) {
        if (rows != other.rows || cols != other.cols)
            throw std::invalid_argument("Matrices must have the same dimensions");

        for (int i = 0; i < rows; ++i)
            for (int j = 0; j < cols; ++j)
                data[i][j] += other.data[i][j];
    }

    // 输出数据
    void print() {
        for (int i = 0; i < rows; ++i) {
            for (int j = 0; j < cols; ++j)
                std::cout << data[i][j] << " ";
            std::cout << "\n";
        }
    }
};

int main() {
    // 创建两个矩阵
    Matrix m1(3, 3);
    Matrix m2(3, 3);

    // 初始化数据
    for (int i = 0; i < m1.rows; ++i)
        for (int j = 0; j < m1.cols; ++j)
            m1.data[i][j] = static_cast<float>(i + j);

    // 进行矩阵加法
    m1.add(m2); // 假设 m2 的数据也已经初始化好了

    // 输出结果
    std::cout << "Matrix 1 after addition:\n";
    m1.print();

    return 0;
}

②. 使用`new`和`delete`操作 `student` 结构体：

#include <iostream>
#include <string>

// 定义student结构体
struct student {
    int num;
    std::string name;
    char sex;
};

// 动态创建student对象
student* createStudent(int num, const std::string& name, char sex) {
    student* p = new student();
    p->num = num;
    p->name = name;
    p->sex = sex;
    return p;
}

// 打印student对象
void printStudent(student* s) {
    std::cout << "Number: " << s->num << ", Name: " << s->name << ", Sex: " << s->sex << '\n';
}

int main() {
    // 创建一个学生对象
    student* stu = createStudent(1001, "Alice", 'F');

    // 输出学生信息
    printStudent(stu);

    // 释放动态内存
    delete stu;

    return 0;
}