C/C++ :: Modifying Row Of Matrix Based On Zero Entry?

Here is the problem:

Write an algorithm such that if an element in an M * M matrix is 0, its entire row and column is set to 0.

Your function prototype may look like the following:

void setZeros ( int size, int arr[][size] );

Heres what I have:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define SIZE 3
void scan_matrix(int arr[][SIZE]);
void print_matrix(int arr[][SIZE]);
void initiailize_matrix(int arr[][SIZE]);
void set_zeros(int matrix[][SIZE]);

[code]....

I'm not sure on how to scan zero for this code and I have bolded some comments that I am having trouble with as well.