fibonacci.java

JAVA 实例手册源码 Examples From Java Examples in a Nutshell, 2nd Edition

/*
 * Copyright (c) 2000 David Flanagan.  All rights reserved.
 * This code is from the book Java Examples in a Nutshell, 2nd Edition.
 * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
 * You may study, use, and modify it for any non-commercial purpose.
 * You may distribute it non-commercially as long as you retain this notice.
 * For a commercial use license, or to purchase the book (recommended),
 * visit http://www.davidflanagan.com/javaexamples2.
 */
package com.davidflanagan.examples.basics;
/**
 * This program prints out the first 20 numbers in the Fibonacci sequence.
 * Each term is formed by adding together the previous two terms in the
 * sequence, starting with the terms 1 and 1.
 **/
public class Fibonacci {
    public static void main(String[] args) {
	int n0 = 1, n1 = 1, n2;          // Initialize variables
	System.out.print(n0 + " " +      // Print first and second terms
			 n1 + " ");      // of the series

        for(int i = 0; i < 18; i++) {    // Loop for the next 18 terms
            n2 = n1 + n0;                // Next term is sum of previous two
            System.out.print(n2 + " ");  // Print it out
	    n0 = n1;                     // First previous becomes 2nd previous
	    n1 = n2;                     // And current number becomes previous
        }
        System.out.println();            // Terminate the line
    }
}