public static void main(String[] args) {
		int[][] arr = {
						{10, 11, 12, 13},
						{14, 15, 16, 17},
						{18, 19, 20, 21},
						{22, 23, 24, 25},
						{26, 27, 28, 29}
					};
		display(arr);
		System.out.println();
		System.out.println();
		switchColumns(0,2,arr);
		display(arr);
		System.out.println();
		System.out.println();
		switchColumns(0,2,arr);
		display(arr);
	}