Lecture Notes on 12 Oct 2011

// Traversing all the elements of a 2-D array
for (int i = 0; i < a.length; i++)
{
  for (int j = 0; j < a[i].length; j++)
  {
    ...
  }
}

// Reversing the rows of a 2-D array
public static int[][] reverseRows (int[][] a)
{
  int[][] b = new int [a.length][a[0].length];
  for (int i = 0; i < a.length; i++)
  {
    for (int j = 0; j < a[i].length; j++)
    {
      b[i][j] = a[i][a.length -1 - j];
    }
  }
  return b;
}