Part (a)

Write the Skyview constructor that fills a 2D array from 1D data.

Solution

public Skyview(int numRows, int numCols, double[] scanned)
{
    view = new double[numRows][numCols];
    int index = 0;
    
    for (int r = 0; r < numRows; r++)
    {
        if (r % 2 == 0)
        {
            for (int c = 0; c < numCols; c++)
            {
                view[r][c] = scanned[index];
                index++;
            }
        }
        else
        {
            for (int c = numCols - 1; c >= 0; c--)
            {
                view[r][c] = scanned[index];
                index++;
            }
        }
    }
}

Part (b)

Write the getAverage method for a rectangular region.

Solution

public double getAverage(int startRow, int endRow, int startCol, int endCol)
{
    double sum = 0;
    int count = 0;
    
    for (int r = startRow; r <= endRow; r++)
    {
        for (int c = startCol; c <= endCol; c++)
        {
            sum += view[r][c];
            count++;
        }
    }
    return sum / count;
}

Key Concepts

Common Mistakes