poj 2413 JAVA

练了练JAVA

本次收获，大数没有a==b这种形式，要用a.compareTo(b),返回1,0，-1

import java.util.*;
import java.text.*;
import java.math.*;

public class Main {
    public static void main(String[] args) {
        Scanner cin = new Scanner(System.in);
        BigInteger x, y, m, n, p, a = BigInteger.valueOf(0);
        int i, flag, ret;
        while (cin.hasNext()) {
            x = cin.nextBigInteger();
            y = cin.nextBigInteger();
            if (a.compareTo(x) == 0 && a.compareTo(y) == 0)
                break;
            ret = 0;
            m = BigInteger.valueOf(0);
            n = BigInteger.valueOf(1);
            while (true) {
                p = m.add(n);
                flag = x.compareTo(p);
                if (flag <= 0)
                    break;
                m = n;
                n = p;
            }
            while (true) {
                p = m.add(n);
                flag = y.compareTo(p);
                if (flag >= 0)
                    ret++;
                else
                    break;
                m = n;
                n = p;
            }
            System.out.println(ret);
        }
    }
}