Question

I have the following code in the caller function

int matrix[3][3] = {{1, 2, 3},{4, 5, 6},{7, 8, 9}};
find_index(matrix);

and the find_index’s prototype is:

void find_index(int** m);

and I got compiler error: cannot convert ‘int (* )[3]’ to ‘int**’

Anyway I can fix this? Thanks!

update:

is there a way that I can then use m[a][b] operator in the second function instead of passing the column number and do m[a * col_num + b]?

Answer 1

A double indexed array still just corresponds to a single pointer, not a pointer to a pointer.