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/*
* The Computer Language Shootout
* http://shootout.alioth.debian.org/
*
* contributed by Andrei Formiga
*/
object partialsums
{
val twodiv3 = 2.0 / 3.0
var n: Double = _
def calculate(s1: Double, s2: Double, s3: Double, s4: Double,
s5: Double, s6: Double, s7: Double, s8: Double,
s9: Double, sign: Double, kd: Double) {
if (kd > n) {
val f = "%.9f\t"
Console.printf( f + "(2/3)^k\n", s1)
Console.printf( f + "k^-0.5\n", s2)
Console.printf( f + "1/k(k+1)\n", s3)
Console.printf( f + "Flint Hills\n", s4)
Console.printf( f + "Cookson Hills\n", s5)
Console.printf( f + "Harmonic\n", s6)
Console.printf( f + "Riemann Zeta\n", s7)
Console.printf( f + "Alternating Harmonic\n" ,s8)
Console.printf( f + "Gregory\n", s9)
}
else {
val k2 = Math.pow(kd, 2.0)
val k3 = k2 * kd
val sin = Math.sin(kd)
val cos = Math.cos(kd)
calculate(s1 + Math.pow(twodiv3, kd - 1.0), s2 + Math.pow(kd, -0.5),
s3 + 1.0 / (kd * (kd + 1.0)), s4 + 1.0 / (k3 * sin*sin),
s5 + 1.0 / (k3 * cos*cos), s6 + 1.0 / kd, s7 + 1.0 / k2,
s8 + sign / kd, s9 + sign / (2.0 * kd - 1.0), -sign, kd + 1.0)
}
}
def main(args: Array[String]) {
n = Integer.parseInt(args(0)).toDouble
calculate(0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 1.0)
}
}
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