猴子吃桃（遞歸）

import java.util.Scanner;

public class Work05 {

	public static int sum(int days){
		if(days==10){return 1;}
		return (sum(days+1)+1)*2;
	}
	public static void main(String[] args) {
//		int sum = 1;
//		
//			for(int j=9;j>0;j--){
//			sum=(sum+1)*2;
//			}
		Scanner sc=new Scanner(System.in);
		System.out.print("請輸入天數:");
		int days=sc.nextInt();
		System.out.println("第"+days+"天所剩的桃子爲:"+sum(days));
	}
}