NAME
    fib - Fibonacci number

SYNOPSIS
    fib(n)

TYPES
    n		integer

    return	integer

DESCRIPTION
    For any integer n, fib(n) returns the Fibonacci number with index n.
    This may be defined by fib(0) = 0, fib(1) = 1 and for any n (positive
    or negative) fib(n) = fib(n-1) + fib(n-2).

EXAMPLE
    > print fib(-2), fib(-1), fib(0), fib(1), fib(2), fib(3), fib(4), fib(5)
    -1 1 0 1 1 2 3 5 -8

LIMITS
    none

LIBRARY
    NUMBER *qfib(NUMBER *n)

SEE ALSO
    XXX - fill in