Return Negative

Return Negative

In this simple assignment you are given a number and have to make it negative. But maybe the number is already negative?

Example:

Kata.MakeNegative(1); // return -1
Kata.MakeNegative(-5); // return -5
Kata.MakeNegative(0); // return 0

Notes:

• The number can be negative already, in which case no change is required.
• Zero (0) can't be negative, see examples above.

using System;

public static class Kata
{
  public static int MakeNegative(int number)
  {
    if(number > 0)
    {
        return -number;
    }
    else if(number < 0)
    {
        return number;
    }
    else
    {
        return 0;
    }
  }
}

其他解法：使用绝对值函数或者问号表达式

using System;

public static class Kata
{
  public static int MakeNegative(int number)
  {
    return -Math.Abs(number);
  }
}

using System;

public static class Kata
{
  public static int MakeNegative(int number)
  {
    return number > 0 ? -number : number;
  }
}