2dArrRowColSum

#include <iostream>

int main()
{
    const int rows{ 3 };
    const int cols{ 3 };

    int arr[rows][cols]{};
    int colSum[cols]{};
    int sum{ 0 };
    int totalSum{ 0 };

    for (int y{ 0 }; y < rows; ++y)
    {
        for (int x{ 0 }; x < cols; ++x)
        {
            arr[y][x] = rand() % 10;
            sum += arr[y][x];
            std::cout << arr[y][x] << '\t';
            colSum[x] += arr[y][x];
        }

        std::cout << sum << '\n';
        sum = 0;
    }
    std::cout << '\n';
    for (int x{ 0 }; x < cols; ++x)
    {
        std::cout << colSum[x] << '\t';
        totalSum += colSum[x];
    }
    std::cout << totalSum << '\n';
}