收银系统

public static void main(String[] args) {
        int integral = 1000;
        double money = 500;
        int price = 0;
        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.println("请选择付款类型：0: 普通顾客, 1: 会员顾客");
            int type = sc.nextInt();
            if (type != 0 && type != 1) {
                System.out.println("请重新输入：");
                continue;
            }
            while (true) {
                System.out.println("请输入消费金额：");
                price = sc.nextInt();
                if (price < 0) {
                    System.out.println("消费金额不能为0，请重新输入！");
                } else {
                    break;
                }
            }
            if (type == 1) {
                pay(price, money, integral);
                break;
            } else {
                pay1(price, money);
                break;
            }
        }
    }

    public static void pay(double price, double money, int integral) {
        integral = integral / 10;
        int balan = (int) (integral - price);
        if (balan > 0) {
//            integral=(int)(integral-price)*10;
            System.out.println("付款成功");
            System.out.println("您本次一共消费：" + price + "元");
            System.out.println("您的账户剩余积分：" + (balan * 10));
            System.out.println("你的账户金额为：" + money);
        }
        if (balan < 0&&money>price) {
            money = money + balan;
            integral = (-balan / 100) * 500;
            System.out.println("付款成功");
            System.out.println("您本次一共消费：" + price);
            System.out.println("您的账户剩余积分：" + integral);
            System.out.println("你的账户余额为：" + money);
　　　　　　　　return;
        }
        if (price > (balan + money)) {
            System.out.println("付款失败");
            System.out.println("您的账户余额不足，请充值！");
            return;
        }
    }

    public static void pay1(double price, double money) {
        double givemoney = money - price;
        if (givemoney < 0) {
            System.out.println("付款失败");
            System.out.println("余额不足");
            return;
        }
        System.out.println("付款成功");
        System.out.println("本次消费" + price + "元，收您：" + money + "元，找零：" + givemoney + "元。");

    }

//----------------------------------------------------------------------------------------------------
public static void pay(double price, double money) {
 double res = money - price; if (res >= 0) { 
System.out.println("付款成功"); 
System.out.println("本次消费" + price + "元,收您:" + money + "元,找零:" + res + "元。"); 
} else { 
System.out.println("付款失败");
System.out.println("余额不足!"); 
}
 }