saving multiple results in a array in java

Question

how can I populate an array with results from multiple operations like a harmonic sum: Harmonic= 1+1/2+1/3+1/4.......+1/n My incomplete version looks like this:

public static void main(String[] args) {
        int x=1, harmonic=0, y=2;
        int[] n;
        n = new int[];

       // for populating the array ?!?!?!
       do {n = {x/y}} 
       y++;
       while (y<=500);

       //for the sum for loop will do...
        for (int z=0; z<=n.length; z++){
             harmonic += n[z];
            }
        System.out.println("Harmonic sum is: " + harmonic);
    }

Community · Accepted Answer · 2020-06-20 09:12:55Z

2

2 things... you should use a double data type since you dont wan t/need truncated values, and you should use for that collections instead of arrays.

public static void main(String[] args) {

    double x = 1, harmonic = 0, y = 2;
    List<Double> arc = new ArrayList<>();

    do {
        arc.add(x / y);
        y++;
    } while (y <= 500);

    for (Double double1 : arc) {
        harmonic += double1;
    }
    System.out.println("Harmonic sum is: " + harmonic);
}

the output will look like:

Harmonic sum is: 5.792823429990519

edit:

using streams:

double streamedHarmonic = arc.stream().mapToDouble(Double::doubleValue).sum();

edited Jun 20, 2020 at 9:12

CommunityBot

11 silver badge

answered Apr 25, 2017 at 9:57

ΦXocę 웃 Пepeúpa ツ

48.4k17 gold badges77 silver badges102 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

dragos Over a year ago

I am at the begining and still learning the basics, that's why I was trying to do it with arrays. I will study your solution. Thx a lot !

Collectives™ on Stack Overflow

saving multiple results in a array in java

1 Answer 1

edit:

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

edit:

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related