Question

int func(int arr[100][150], int rows, int columns);
int func(int arr[100][150], int rows, int columns)
{
   //stuff here
}

This function works. What should I do if I would like to assign arr size to arr[rows][columns], but not 100 and 150 all the time? If I assign it to 100 and 150 it probably uses more memory than it should if rows and colums are smaller?

int func(int arr[rows][columns], int rows, int columns);
int func(int arr[rows][columns], int rows, int columns)
{
   //stuff here
}

or

int func(int arr[][], int rows, int columns);
int func(int arr[][], int rows, int columns)
{
   //stuff here
}

doesn’t work.

Answer 1

Pass the dimensions first:

int func(int rows, int columns, int arr[rows][columns])
{
    …
}

(Actually, the first dimension may be omitted. Dimensions after the first are needed to compute addresses.)