Java > AP-1 > copyEvens (CodingBat Solution)

Problem:

Given an array of positive ints, return a new array of length "count" containing the first even numbers from the original array. The original array will contain at least "count" even numbers.

copyEvens({3, 2, 4, 5, 8}, 2) → {2, 4}
copyEvens({3, 2, 4, 5, 8}, 3) → {2, 4, 8}
copyEvens({6, 1, 2, 4, 5, 8}, 3) → {6, 2, 4}


Solution:

public int[] copyEvens(int[] nums, int count) {
  int ctr = 0;
  int[] array = new int[count];
  for (int i = 0; i < nums.length; i++) {
    if (nums[i] % 2 == 0) {
      array[ctr] = nums[i];
      ctr++;
    }
      if (ctr == count)
        return array;
  }
  return nums;
}

5 comments:

  1. AnonymousOctober 15, 2016 at 3:04 AM

    public int[] copyEvens(int[] nums, int count) {
    int[] result = new int[count];
    int counter = 0;
    for(int i=0; i<nums.length && counter<count; i++)
    {
    if(nums[i]%2==0)
    {
    result[counter]=nums[i];
    counter++;
    }
    }
    return result;
    }

    ReplyDelete
  2. AnonymousFebruary 19, 2018 at 12:43 AM

    int index=0;
    int[] arr = new int[count];
    for(int n : nums){
    if(n%2==0 && index<count) {
    arr[index]=n;
    index++;
    }
    }return arr;

    ReplyDelete
  3. mühendisgözündenJune 18, 2019 at 5:04 AM

    int[] filteredArray = Arrays.stream(nums).filter(n -> n%2==0).toArray();
    return Arrays.copyOfRange(filteredArray, 0 ,count);

    ReplyDelete
  4. AnonymousSeptember 20, 2020 at 3:30 AM

    public int[] copyEvens(int[] nums, int count) {
    int[] arr = new int[count];
    int index = 0;
    for(final int n : nums){
    if(n % 2 == 0 && index<count) {
    arr[index]=n;
    index++;
    }
    }
    return arr;
    }

    ReplyDelete
  5. AndrejSeptember 16, 2022 at 5:35 AM

    With Stream API

    return Arrays.stream(nums).filter(x->x%2 ==0).limit(count).toArray();

    ReplyDelete