HDU-1316 How Many Fibs?(Java大数)

Here

给定一个区间求斐波那契数的个数，利用循环递推即可

import java.math.BigInteger; import java.util.Scanner; public class Main { public static void main(String [] args){ Scanner in = new Scanner(System.in); BigInteger a,b; BigInteger ZERO = BigInteger.ZERO; while(in.hasNext()) { a = in.nextBigInteger(); b = in.nextBigInteger(); if(a.compareTo(ZERO)==0 && b.compareTo(ZERO)==0) break; System.out.println(Fib(a,b)); } } //第一次写函数啊 public static int Fib(BigInteger a,BigInteger b) { int sum = 0; BigInteger f = new BigInteger("1"); BigInteger s = new BigInteger("2"); BigInteger tmp; while(true) { if(f.compareTo(b)>0) break; if(f.compareTo(a) >= 0) sum++; tmp = f; f = s; s = s.add(tmp); } return sum; } }