21. Arrays

One-dimensional arrays:

  int x[3];

  The elements are: x[0], x[1], x[2]

  for( i = 0;  i < 3;  ++i)
  {
    /* use x[i] ... */
  }

Two-dimensional arrays:

  int a[2][3];

  The elements are:

    a[0][0], a[0][1], a[0][2],
    a[1][0], a[1][1], a[1][2]

  a[0] is a pointer to the first row.
  a[1] is a pointer to the second row.