JAVA
用户循环输入四位会员号,判断是否中奖。程序开始时生成一个0~9的随机数,当用户会员号的百位与十位的差值与随机数字相等时为中奖

Random random = new Random(); int i = random.nextInt(10); while (true){ System.out.print("幸运号码:" + i + "请输入4位会员号:"); Scanner scanner = new Scanner(System.in); String next = scanner.next(); int b = Integer.parseInt(next.substring(1,2)); int s = Integer.parseInt(next.substring(2,3)); System.out.println("百位"+b+",十位"+s + "差为:" + (b - s)); if (b - s == i){ break; } }