Fig10_40.java

public class Fig10_40
{
    /**
     * Compute Fibonacci numbers as described in Chapter 1.
     */
    public static int fib( int n )
    {
        if( n <= 1 )
            return 1;
        else
            return fib( n - 1 ) + fib( n - 2 );
    }

    /**
     * Compute Fibonacci numbers as described in Chapter 1.
     */
    public static int fibonacci( int n )
    {
        if( n <= 1 )
            return 1;

        int last = 1;
        int nextToLast = 1;
        int answer = 1;
        for( int i = 2; i <= n; i++ )
        {
            answer = last + nextToLast;
            nextToLast = last;
            last = answer;
        }
        return answer;
    }

    public static void main( String [ ] args )
    {
        System.out.println( "fib( 7 ) = " + fib( 7 ) );
        System.out.println( "fibonacci( 7 ) = " + fibonacci( 7 ) );
    }
}