1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
/* The Computer Language Shootout
http://shootout.alioth.debian.org/
contributed by Josh Goldfoot
modified by Isaac Gouy
*/
import java.text.DecimalFormat;
import java.text.NumberFormat;
public class partialsums {
private static final double twothirds = 2.0/3.0;
private static final NumberFormat formatter = new DecimalFormat("#0.000000000");
public static void main(String[] args) {
int n = Integer.parseInt(args[0]);
double a1 = 0.0, a2 = 0.0, a3 = 0.0, a4 = 0.0, a5 = 0.0;
double a6 = 0.0, a7 = 0.0, a8 = 0.0, a9 = 0.0, alt = -1.0;
for (int k=1; k<=n; k++){
double k2 = (double)k * (double)k, k3 = k2 * (double)k;
double sk = Math.sin(k), ck = Math.cos(k);
alt = -alt;
a1 += Math.pow(twothirds,k-1);
a2 += 1.0/Math.sqrt(k);
a3 += 1.0/(k*(k+1.0));
a4 += 1.0/(k3 * sk*sk);
a5 += 1.0/(k3 * ck*ck);
a6 += 1.0/k;
a7 += 1.0/k2;
a8 += alt/k;
a9 += alt/(2.0*k -1.0);
}
System.out.println(formatter.format(a1) + "\t(2/3)^k");
System.out.println(formatter.format(a2) + "\tk^-0.5");
System.out.println(formatter.format(a3) + "\t1/k(k+1)");
System.out.println(formatter.format(a4) + "\tFlint Hills");
System.out.println(formatter.format(a5) + "\tCookson Hills");
System.out.println(formatter.format(a6) + "\tHarmonic");
System.out.println(formatter.format(a7) + "\tRiemann Zeta");
System.out.println(formatter.format(a8) + "\tAlternating Harmonic");
System.out.println(formatter.format(a9) + "\tGregory");
}
}
|
