P. 121 Ex. 12.3

// Shavit Borisov
// CW

public class ArrayClass
{
    double[][] array;

    public ArrayClass(int rows, int cols)
    {
        array = new double[rows][cols];
    }

    public void cellIni(int row, int col, double value)
    {
        array[row][col] = value;
    }

    public double squareSurroundings(int row, int col)
    {
        double sum = 0;
        sum += col - 1 >= 0 ? array[row][col - 1] : 0;
        sum += col + 1 <= array[col].length ? array[row][col + 1] : 0;
        sum += row - 1 >= 0 ? array[row - 1][col] : 0;
        sum += row + 1 <= array.length ? array[row + 1][col] : 0;
        return sum;
    }
    public double allSurroundings(int row, int col)
    {
        double sum = 0;
        sum += col - 1 >= 0 ? array[row][col - 1] : 0;
        sum += col + 1 <= array[col].length ? array[row][col + 1] : 0;
        sum += row - 1 >= 0 ? array[row - 1][col] : 0;
        sum += row + 1 <= array.length ? array[row + 1][col] : 0;
        sum += (col - 1 >= 0) && (row - 1 >= 0) ? array[row - 1][col - 1] : 0;
        sum += (col + 1 <= array[col].length) && (row + 1 <= array.length) ? array[row + 1][col + 1] : 0;
        sum += (col - 1 >= 0) && (row + 1 <= array.length) ? array[row + 1][col - 1] : 0;
        sum += (col + 1 <= array[col].length) && (row - 1 >= 0) ? array[row - 1][col + 1] : 0;
        return sum;
    }
}