Arrays in for loops

Question

I have an array called blockHeights, which contains 3 values inside of it, namely 1,2,3. So blockHeights[0] is equal to 1.

I also have a loop:

for (int i = 1; i <= blockHeights.length; i++)

In the first time around the loop, I want to create a variable called totalBlockHeights where it is

int totalBlockHeights = blockHeights[0] + blockHeights [1] + blockHeights [2];

However, in the next loop I want that variable to change, so that it only adds blockHeights[1] and blockHeights[2] together, ignoring blockHeights[0].

How would I go about doing this?

Do you also want the third loop to assign only blockHeights[2] to totalBlockHeights? — Ḟḹáḿíṅḡ Ⱬỏḿƀíé
– Ḟḹáḿíṅḡ Ⱬỏḿƀíé, Commented Sep 14, 2014 at 10:51

bcsb1001 · Accepted Answer · 2014-09-14 10:51:26Z

3

Try the following (I'm assuming the third iteration should only include blockHeights[2], following the pattern):

for (int i = 1; i <= blockHeights.length; i++) {
    int totalBlockHeights;
    for (int j = i - 1; j < blockHeights.length; j++) { // all block heights from here onwards
        totalBlockHeights += blockHeights[j];
    }
    // do whatever
}

answered Sep 14, 2014 at 10:51

bcsb1001

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1 Comment

Ḟḹáḿíṅḡ Ⱬỏḿƀíé Over a year ago

That's what I was thinking :)

Unix von Bash · Accepted Answer · 2014-09-14 11:01:10Z

2

Well, if you want the sum of your array, and the sum of the array without first value

int totalBlockHeights = 0;
for(int i = 0; i < blockHeights.length; i++){
    totalBlockHeights += blockHeights[i];
}

System.out.println(totalBlockHeights);
System.out.println("totalBlockHeights without first value = " + (totalBlockHeights - blockHeights[0]));

this way you only loop once

answered Sep 14, 2014 at 11:01

Unix von Bash

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Comments

Maciej Szumielewicz · Accepted Answer · 2014-09-14 10:53:30Z

0

Try following code:

public class Loop {

    public static void main(String[] argv) {

        int[] blockHeights = new int[] {1, 2, 3};
        int totalBlockHeights = 0;

        for(int i = 0; i < blockHeights.length; i++) {
            totalBlockHeights = 0;
            for(int j = i; j < blockHeights.length; j++) {
                totalBlockHeights += blockHeights[j];
            }
            System.out.println(totalBlockHeights);
        }
    }

}

answered Sep 14, 2014 at 10:53

Maciej Szumielewicz

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Comments

Nikola Dimitrovski · Accepted Answer · 2014-09-14 10:54:13Z

0

    int[] blockHeights = new int[] { 1, 2, 3 };
    int totalBlockHeights = 0;
    int customBlockHeights = 0;

    for (int i = 0; i < blockHeights.length; i++) {
        totalBlockHeights += blockHeights[i];
        if (i == 0) {
            continue;
        }
        customBlockHeights += blockHeights[i];
    }
    System.out.println(totalBlockHeights);
    System.out.println(customBlockHeights);

This will print:

6
5

You dont need two for to achieve that.

answered Sep 14, 2014 at 10:54

Nikola Dimitrovski

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Yuraj · Accepted Answer · 2014-09-14 10:57:50Z

0

you can perform this on two for loop outer loop for (int i = 1; i <= blockHeights.length; i++), and in inner loop (take a variable j) you can do like int totalBlockHeights = totalBlockHeights + blockHeights[j], and for i<j, you can just continue the for loop.

as answered by btrs20

edited Sep 14, 2014 at 10:57

Yuraj

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answered Sep 14, 2014 at 10:51

ARVIND SHAH

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