Multiples of 3 or 5

2017-12-25  本文已影响0人  Magicach

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.

Finish the solution so that it returns the sum of all the multiples of 3 or 5 below the number passed in.

Note: If the number is a multiple of both 3 and 5, only count it once.

Courtesy of ProjectEuler.net

Good Solution 1:

public class Solution {

  public int solution(int number) {
    int sum=0;
    
    for (int i=0; i < number; i++){
      if (i%3==0 || i%5==0){sum+=i;}
    }
    return sum;
  }
}

Good Solution 2:

import java.util.stream.IntStream;

public class Solution {
  public int solution(int number) {
    return IntStream.range(0, number)
                    .filter(n -> (n % 3 == 0) || (n % 5 == 0))
                    .sum();
  }
}
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