CODEWITHSUNDEEP
javaarraylist
Comsciers
Comsciers

Reputation: 154

Remove Even Elements after their Addition in an ArrayList and return modified ArrayList

package com.company;

import java.util.*;
import java.io.*;

public class Main {
    public static int processArray(ArrayList<Integer> array) {

    int sum=0;
    for (int i=0;i<array.size()-1;i++) {
            if (array(i) %2 == 0 && array.get(i+1)%2==0){
                    sum += array.get(i);
                    array.set(i,sum);
                    array.remove(i+1);
                    i--;
            }
    }
    return array.size();
}

public static void main (String[] args) {
    ArrayList<Integer> arrayList = new ArrayList<Integer>();
    Scanner in = new Scanner(System.in);
    while(in.hasNextInt()) {
        int num = in.nextInt();
        if (num < 0)
            break;
        arrayList.add(new Integer(num));
    }
    int new_length = processArray(arrayList);
    for(int i=0; i<new_length; i++)
        System.out.println(arrayList.get(i));
}
}

=======================================

Input

3 6 36 61 121 66 26 376 661 6 -1

I need Output to be

3 42 61 121 468 661 6

My Output

3 6 42 61 121 66 92 468 661 6

What am i doing wrong here?

Upvotes: 1

Views: 297

Answers (2)

Andreas
Andreas

Reputation: 159125

Since others are trying (and failing) to give you working solution, here it is, with comments on changed lines:

public static ArrayList<Integer> processArray(ArrayList<Integer> array) {
    for (int i = 0; i < array.size() - 1; i++) { // don't process last value (it has no next value)
        if (array.get(i) % 2 == 0 && array.get(i+1) % 2 == 0) {
            int sum = array.get(i) + array.get(i+1); // add current and next value
            array.set(i, sum); // update current value
            array.remove(i+1); // remove next value
            i--; // make sure we re-process current value, to compare with "new" next value
        }
    }
    return array; // return modified array
}

Upvotes: 2

Ganesh S
Ganesh S

Reputation: 520

Try this below code. This will calculate sum of all even index digits entered in arraylist, removes the even indexed digits and you will have the altered list.

import java.util.ArrayList;
import java.util.Scanner;

public class Main1 {
    public static int processArray(ArrayList<Integer> array) {

        int sum = 0;
        for (int i = 0; i < array.size(); i++) {
            if (array.get(i) % 2 == 0) {
                sum += array.get(i);
                array.remove(i);
            }
        }
        return sum;
}

    public static void main(String[] args) {
        ArrayList<Integer> arrayList = new ArrayList<Integer>();
        Scanner in = new Scanner(System.in);
        while (in.hasNextInt()) {
            int num = in.nextInt();
            if (num < 0)
                break;
            arrayList.add(new Integer(num));
        }
        int sum = processArray(arrayList);
        System.out.println("Sum of even index numbers " + sum);
        for (int i = 0; i < arrayList.size(); i++)
            System.out.println(arrayList.get(i));
    }
}

Upvotes: -1

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