2D array passed in function prototype [duplicate]

Question

Here is my code in c++.

void multTable(int arr[][], int maxNum);

Before the main method, I declared this function prototype and then defined it after the main method towards the bottom of my code. However, I get an error stating that multidimensional array must have bounds for all dimensions. I don't understand how I can fix this.

Answer 1

If your 2D arrays will have a fixed column size. You can do this:

void multTable(int arr[][MAX_COLS], int maxNum);

You'll have to call it like this:

#define MAX_ROWS (5)
#define MAX_COLS (7)

int arr[MAX_ROWS][MAX_COLS] = {...};
multTable(arr, 7);

Answer 2

You may use this prototype:

template <int ROW, int COLUMN>
void multTable(int (&arr)[ROW][COLUMN], int maxNum);