benchmark/bench/random.groovy

/*
 * The Computer Language Shootout
 * http://shootout.alioth.debian.org/
 *
 * contributed by Jochen Hinrichsen
 */

def IM = 139968
def IA = 3877
def IC = 29573
def last = 42D

def gen_random(Double max) {
    last = (last * IA + IC) % IM
    max * last / IM
}

def n = (args.length == 0 ? 1 : args[0].toInteger()) - 1
while (n--) {
    gen_random(100D)
}

def nf = java.text.NumberFormat.getInstance()
nf.setMaximumFractionDigits(9)
nf.setMinimumFractionDigits(9)
nf.setGroupingUsed(false)
println nf.format(gen_random(100D))