arr2dRowColSum

#include <iostream>

int main()
{
    const int tabSize{ 9 };
    const int rows{ 4 };
    const int cols{ 5 };
    int arr[rows][cols]{};
    int colSum[cols]{};
    int sum{ 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;
    }
    for (int x{ 0 }; x <= cols * tabSize; ++x) { std::cout << '-'; }; std::cout << '\n';
    for (int x{ 0 }; x < cols; ++x) { sum += colSum[x]; std::cout << colSum[x] << '\t'; };
    std::cout << "| " << sum << '\n';

    return 0;
}