#include <iostream>

int sum(int(&arry)[2][3])
{
    int total = 0;

    for (int i = 0; i < 2; i++)
        for (int j = 0; j < 3; j++)
            total += arry[i][j];

    return total;
}

int main()
{
    int gg [2][3] =
    {
        {1, 2, 3},
        {4, 5, 6}
    };

    std::cout << sum(gg) << std::endl;
}

运行结果

21