兔子数量问题（斐波那契数列）

 

题目：古典问题：有一对兔子，从出生后第3个月起每个月都生一对兔子，小兔子长到第三个月后每个月又生一对兔子，假如兔子都不死，问每个月的兔子总数为多少？ 
1.程序分析： 兔子的规律为数列1,1,2,3,5,8,13,21....

 

 

package com.likunjie;

import java.util.Scanner;

public class RabbitTest {
    //此题也是斐波那契 数列题目
    public static void main(String[] args) {
        while (true) {
            int a = 1, b = 1;
            int temp = 0;
            Scanner scan = new Scanner(System.in);
            System.out.print("Please input a number: ");
            int months = scan.nextInt();
            if (months == 1 || months == 2) {
                System.out.println("There's " + 1
                        + " couple of rabbit in total.");
            } else if (months > 2) {
                for (int i = 3; i <= months; i++) {
                    temp = b;
                    b = a + b;
                    a = temp;
                    
                    System.out.println("第" + i + "个月的兔子数是：" + b);
                }
            } else{
                System.out.println("Wrong Error....System exit....");
                break;
            }
        }
    }
}