How can I itterate through a 2d array in C given as a pointer?

Question

So I have a function like this:

int *func(int *arr, size_t n);

Where *arr is the 2d array and n is the size of the array. The array is a square, so n is both width and height.
I tried doing this:

int val = arr[x][y];

But it gave me an error saying the subscripted value is neither array nor vector.

Does someone know what I can do?

Answer 1

You can do it in multiple different ways. One would be to cast the array first:

int** nArr = (int**)arr;
Int val = nArr[x][y];

An array, even a 2d array ist consecutive in memory, so you can also:

int val = *(nArr+(n*x)+y);

Answer 2

You can use a loop like

for(int i=0; i<n; i++){

for(int j=0; j<n; j++)
printf("%d ", *(*(arr+i) + j) );

printf("\n");
}
edit:
ChrisVIN