Fibonacci.java

Below is the syntax highlighted version of Fibonacci.java from §2.3 Recursion.

/******************************************************************************
 *  Compilation:  javac Fibonacci.java
 *  Execution:    java Fibonacci n
 *
 *  Computes and prints the first n Fibonacci numbers.
 *
 *  WARNING:  this program is spectacularly inefficient and is meant
 *            to illustrate a performance bug, e.g., set n = 45.
 *
 *
 *   % java Fibonacci 7
 *   1: 1
 *   2: 1
 *   3: 2
 *   4: 3
 *   5: 5
 *   6: 8
 *   7: 13
 *
 *   Remarks
 *   -------
 *    - The 93rd Fibonacci number would overflow a long, but this
 *      will take so long to compute with this function that we
 *      don't bother to check for overflow.
 *
 ******************************************************************************/

public class Fibonacci {
    public static long fibonacci(int n) {
        if (n <= 1) return n;
        else return fibonacci(n-1) + fibonacci(n-2);
    }

    public static void main(String[] args) {
        int n = Integer.parseInt(args[0]);
StdOut.println(fibonacci(n));
/*
        for (int i = 1; i <= n; i++)
            StdOut.println(i + ": " + fibonacci(i));
*/
    }

}