point to 2D array using double pointer

Question

Here is code :

void nextGeneration(int **board) {

int editBoard[row][col];
    ...
    displayBoard(editBoard);
}

void displayBoard(int **board) {
    ...
}

I get this error msg:

GOL.c: In function ‘nextGeneration’: GOL.c:64: warning: passing argument 1 of ‘displayBoard’ from incompatible pointer type GOL.c:28: note: expected ‘int **’ but argument is of type ‘int (*)[(long unsigned int)(col)]’

I just don't know how to point 2D array that will be accepted to void displayBoard(int **board) function.

How can I do that?

Thank you very much

Answer 1

A double pointer is not a 2D array, but you can do it using a single pointer

#include <stdio.h>

#define COL_WIDTH 2

int displayBoard(int *board, int row, int col)
{
    // editBoard[row][col]
    return board[(COL_WIDTH*row)+col];
}

int main(void)
{
    int board[2][COL_WIDTH] = { {1,2}, {3,4} };

    printf("%d\n", displayBoard((int *)(board), 1, 1));
    printf("%d\n", displayBoard((int *)(board), 0, 1));
}