csharp basic exercises: the closest zero [difficulty: Level 1] - view the C # programming classic exam, exercises of varying difficulty C #, C # novice suitable for self-study of advanced training

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csharp basic exercises: the closest zero [difficulty: Level 1]:

Just find the closest value to zero from the list. Please note that there is a list of negatives.

The list is not always empty and contain only integers. Return

无

If it can not only define such a value. Of course, we look forward to 0 as the closest value to zero.

example:

代码
[2,4,-1,-3] => -1
[5,2,-2] =>无
[5,2,2] => 2
[13,0,-6] => 0

Programming objectives:

public class Kata
{
  public static int? Closest(int[] arr)
  {
    // return null if it is not possible to return 1 unique closest value
    return 0;
  }
}

Test sample:

namespace Solution {
  using NUnit.Framework;
  using System;
  using System.Collections.Generic;
  [TestFixture]
  public class SolutionTest
  {
      get
      {
        yield return new TestCaseData(new int[] {10, 3, 9, 1}).Returns(1).SetDescription("Simple test");
        yield return new TestCaseData(new int[] {2, 4, -1, -3}).Returns(-1).SetDescription("Simple test");
        yield return new TestCaseData(new int[] {13, 0, -6}).Returns(0).SetDescription("Simple test");
        yield return new TestCaseData(new int[] {13, 0, 0, -6}).Returns(0).SetDescription("Simple test");
      }

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