C two-dimensional array of two-dimensional array

Question

I want to represent a sudoku board as a 2-dim array of 2-dim array. The inner array contains 3 rows x 3 columns, making up a box of 9 cells. The outer array should also be 3x3 holding the 9 boxes.

How should I write this structure in C? int board[[3]][[3]]? Of course it is wrong. Is it actually do-able in C?

Thanks!

user1599559 · Accepted Answer · 2013-04-27 15:06:37Z

2

In C, you can make a 4 dimensional array, with an outer and inner set of coordinates.

int board[3][3][3][3];

Or you can make a struct to represent the inner board;

struct InnerBoard {
  int board[3][3];
};

InnerBoard board[3][3];

answered Apr 27, 2013 at 15:06

user1599559

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1 Comment

ozstudent Over a year ago

Thanks for the answer. I think a struct will definitely make the program clearer.

Xymostech · Accepted Answer · 2013-04-27 15:05:22Z

1

What you're looking for is a 4-dimensional array.

int board[3][3][3][3];

The first two indices determine which box, and the second two indices determine which cell inside of the box.

answered Apr 27, 2013 at 15:05

Xymostech

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