Multiples of 3 and 5

Multiples of 3 and 5

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.

 

using System;
using System.Linq;

public static class Kata
{
  public static int Solution(int value)
  {
    // Magic Happens
      return value == 0 ? 0 : Enumerable.Range(1, value - 1).Where(x => (x % 3 == 0 || x % 5 == 0)).Aggregate(0, (sum, y) => sum + y);
  }
}

 

 

其他人的解法：

如果只是简单的求和的话，可以直接使用Sum函数，   Aggregate一般是在对每一项做了处理之后才使用的

using System.Linq;

public static class Kata
{
  public static int Solution(int value)
  {
    if (value == 0)
      return 0;
  
    return Enumerable
      .Range(1, value - 1)
      .Where(x => x % 3 == 0 
               || x % 5 == 0)
      .Sum();
  }
}

 

作者:Chuck Lu    GitHub