Java啤酒问题

啤酒问题：

12块钱买啤酒，2块钱一瓶

两个空瓶换一瓶酒

四个瓶盖换一瓶酒

 

最后能买多少啤酒？

 

问题：统一换算成钱，再买酒，递归实现

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package cn.edu.lcudcc;   public class BeerQuestion {       // 定义一个静态的成员变量用于存储可以买的酒数量     public static int totalNumber; // 总数量     public static int lastBottleNumber; // 记录每次剩余的瓶子个数     public static int lastCoverNumber; // 记录每次剩余的盖子个数       public static void main(String[] args) {         int money = 12;         buy(money);         System.out.println("totalNumber = " + totalNumber);         System.out.println("lastBottleNumber = " + lastBottleNumber);         System.out.println("lastCoverNumber = " + lastCoverNumber);     }       /**      * 拿钱买酒      * @param money      */     private static void buy(int money) {         int buyNumber = money / 2;         totalNumber += buyNumber;           int coverNumber = lastCoverNumber + buyNumber;         int bottleNumber = lastBottleNumber + buyNumber;           int allMoney = 0;         if(coverNumber >= 4) {             allMoney += (coverNumber / 4) * 2;         }         lastCoverNumber = coverNumber % 4;           if (bottleNumber >= 2){             allMoney += (bottleNumber / 2) * 2;         }         lastBottleNumber = bottleNumber % 2;           if(allMoney >= 2) {             buy(allMoney);         }     } }

 

输出结果：

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1 2 3

totalNumber = 19 lastBottleNumber = 1 lastCoverNumber = 3