validfibonacci.java

来自「随书的代码」· Java 代码 · 共 32 行

import java.math.BigInteger;


public class ValidFibonacci {

  public static void main(String[] args) {
   
      BigInteger low  = BigInteger.ONE;
      BigInteger high = BigInteger.ONE;      
      
      System.out.println("<?xml version=\"1.0\"?>");  
      System.out.println("<!DOCTYPE Fibonacci_Numbers [");  
      System.out.println(
       "  <!ELEMENT Fibonacci_Numbers (fibonacci)*>");  
      System.out.println("  <!ELEMENT fibonacci (#PCDATA)>");  
      System.out.println(
       "  <!ATTLIST fibonacci index NMTOKEN #REQUIRED>");  
      System.out.println("]>");  
      System.out.println("<Fibonacci_Numbers>");  
      for (int i = 0; i < 10; i++) {
        System.out.print("  <fibonacci index=\"" + i + "\">");
        System.out.print(low);
        System.out.println("</fibonacci>");
        BigInteger temp = high;
        high = high.add(low);
        low = temp;
      }
      System.out.println("</Fibonacci_Numbers>");  

  }

}