I'm trying to fill the array horizontally alternately such as:

My default ArrayFill function is :

void fillArray(std::array<std::array<int, maxColumns>, maxRows> & array, size_t rows, size_t columns)
{
    if (rows == 0 || rows > maxRows || columns == 0 || columns > maxColumns)
        throw std::invalid_argument("Invalid array size.");
    int value = 1;
    for (size_t row = 0; row < rows;   row)
        for (size_t column = 0; column < columns;   column)
            array[row][column] = value  ;
}

How can I change the implementation that will fill the array horizontally?

• UPDATE -

I tried the suggested solution and here is the result:

-- FINAL -- ( IT WORKS PERFECTLY )

CodePudding user response：

there are two properties which you should obey:

1. start filling not from top (row=0) but bottom (row=rows-1)
2. each row (from bottom to top) changes the order of columns

so, finally it can look like this:

int value = 1;
int colOrder = 1; // 1 means from left to right, 0 from right to left
for (size_t row = 0; row < rows;   row) {
    for (size_t column = 0; column < columns;   column)
        array[rows - 1 - row][colOrder ? column : (columns - 1 - column)] = value  ;
    colOrder ^= 1; // change column order
}