写一个完整代码，使用using namespace std，编写一个二维数组类double A[m][n]，通过函数计算该数组的最大值、最小值、均值，一并返回并打印输出，使用using namespace std的形式

#include <iostream>
#include <vector>

class Array2D {
private:
    int m;
    int n;
    std::vector<std::vector<double>> data;

public:
    Array2D(int rows, int cols) : m(rows), n(cols) {
        data.resize(m, std::vector<double>(n));
    }

    void setValue(int row, int col, double value) {
        if (row >= 0 && row < m && col >= 0 && col < n) {
            data[row][col] = value;
        } else {
            std::cout << "Invalid index!" << std::endl;
        }
    }

    void printArray() const {
        for (const auto &row : data) {
            for (const double elem : row) {
                std::cout << elem << " ";
            }
            std::cout << "\n";
        }
    }

    double getMaxValue() const {
        if (m == 0 || n == 0) return 0;
        double max_val = data[0][0];
        for (int i = 0; i < m; ++i) {
            for (int j = 0; j < n; ++j) {
                max_val = std::max(max_val, data[i][j]);
            }
        }
        return max_val;
    }

    double getMinValue() const {
        if (m == 0 || n == 0) return 0;
        double min_val = data[0][0];
        for (int i = 0; i < m; ++i) {
            for (int j = 0; j < n; ++j) {
                min_val = std::min(min_val, data[i][j]);
            }
        }
        return min_val;
    }

    double getAverage() const {
        if (m == 0 || n == 0) return 0;
        double sum = 0;
        for (int i = 0; i < m; ++i) {
            for (int j = 0; j < n; ++j) {
                sum += data[i][j];
            }
        }
        return sum / (m * n);
    }

    void computeAndPrintMinMaxAvg() const {
        double max_value = getMaxValue();
        double min_value = getMinValue();
        double average = getAverage();

        std::cout << "Max Value: " << max_value << ", Min Value: " << min_value << ", Average: " << average << std::endl;

        // If you want to print the array too, call this line after computing min and max
        // printArray();
    }
};

int main() {
    int rows = 3, cols = 4;
    Array2D arr(rows, cols);

    // Set some values
    arr.setValue(0, 0, 5.5);
    arr.setValue(1, 2, 2.7);
    arr.setValue(2, 3, 9.8);

    arr.computeAndPrintMinMaxAvg();

    return 0;
}

这段代码定义了一个名为`Array2D`的二维数组类，包含了初始化、设置元素值、打印数组、获取最大值、最小值和平均值的功能。`computeAndPrintMinMaxAvg`函数将这三项结果一起输出到控制台。