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November 05 2008

robi42
21:38

Groovy Fibber

So, here's a (rather) simple Fibonacci.groovy: 
/**
 * Calculating and printing out a
 * certain amount of Fibonacci numbers.
 */
class Fibber {
    BigInteger current, next, newCurrent

    // does the actual job:
    def calcAndPrint(numberOf) {
        current = 1; next = 1
        numberOf.times {
            print "$current "
            newCurrent = next
            next += current
            current = newCurrent
        }; println ''
    }
}

try {
    def amount = args[0].toInteger()
    new Fibber().calcAndPrint(amount)
} catch (e) {
    println 'usage: groovy Fibonacci.groovy <amountNumber>'
}

Now, e.g., this shell input: 
$ groovy Fibonacci.groovy 13
results in this output: 
1 1 2 3 5 8 13 21 34 55 89 144 233

:-)

Update: Here's how you could do this with Helma NG.