CODEWITHSUNDEEP
java
Rein Fowler
Rein Fowler

Reputation: 25

Having problems with multiplying Arrays

import java.util.*;

public class Main {
    public static void main(String[] args) {
     double[] temp = {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};
     double[] tripple = {26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50};

        for (int i = 0; i < temp.length; i++) {
            temp[i] = (int) Math.pow(temp[i], 2);
        }

        for (double value : temp) {
            System.out.println(value);
        }

        for (int k = 26; k < 50; k++) {
            tripple[k] = (int) Math.pow(temp[k], 3);
        }

        for (double value : tripple) {
            System.out.println(value);
        }
    }
 }

I have been trying to get my second array to give cubed numbers from 26 onwards. So far, I have the 1-25 working, but I can't get the last twenty five to work. I've tried everything I can think of, and what is there is the last iteration after hours of banging my head on the walls.

Upvotes: 0

Views: 61

Answers (3)

Harsh Joshi
Harsh Joshi

Reputation: 117

Those are two different arrays. Both will start from 0. So you need to use following in second array.

for(int k=0;k<tripple.length;k++){}

This means 

triple[0]=26;

and so on.

One more thing you have used temp array in the line below

tripple[k] = (int) Math.pow(temp[k], 3);

Here values in the temp array are different.

temp[0]=1;
temp[1]=4;

and so on

Upvotes: 0

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 727137

This loop is incorrect, because it uses values instead of indexes:

for (int k = 26; k < 50; k++) {
    tripple[k] = (int) Math.pow(temp[k], 3);
}

When you apply operator [i] to an array, it means "give me the element at position i counting from zero". It does not mean "give me an element whose value is i".

k needs to be from zero to tripple.length(), the same way the i goes in your first for loop.

Upvotes: 1

Jesper
Jesper

Reputation: 207026

The error is in this line:

for (int k = 26; k < 50; k++)

The indices in the array tripple do not go from 26 to 50, but from 0 to the length of the array.

for (int k = 0; k < tripple.length; k++)

Upvotes: 1

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