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Multiples of 3 or 5

Multiples of 3 or 5

作者: Magicach | 来源:发表于2017-12-25 22:37 被阅读0次

    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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