public static void main(String[] args) {
		int[][] arr ={{1,2,3,4},{5,0,7,8},{9,10,11,12},{13,14,15,16}};
		for(int[] a : arr){
			for(int b : a){
				System.out.print(b);
				System.out.print(' ');
			}
			System.out.println();
		}
		
		setZero(arr);
		for(int[] a : arr){
			for(int b : a){
				System.out.print(b);
				System.out.print(' ');
			}
			System.out.println();
		}
	}