Method computeByteNum

java/Chapter 5/Question5_8/Question.java:6–8

(int width, int x, int y)

public class Question {
	public static int computeByteNum(int width, int x, int y) {
		return (width * y + x) / 8;
	}
	
	public static void drawLine(byte[] screen, int width, int x1, int x2, int y) {
		int start_offset = x1 % 8;