30秒学会 C# 片段 – Median

Finds the median of a list of numbers.

Use the params keyword to accept either an array or a variable number of arguments.
Sort the array using Array.sort() and find the median.
Which is either the middle element of the list, if the list length is odd or the average of the two middle elements, if the list length is even.

代码实现

public static partial class _30s 
{
  public static double Median(params double[] values)
  {
    Array.Sort(values);
    if (values.Length % 2 == 0)
      return (values[values.Length / 2 - 1] + values[values.Length / 2]) / 2;
    return (double)values[values.Length / 2];
  }
}

使用样例

double[] nums = { 5, 6, 7, 8 };

_30s.Median(4, 8, 1); // 4
_30s.Median(nums); // 6.5