十六进制转十进制

描述：

将十六进制的字符串转为十进制的整数。

例如：

HexToDec(“1”) => 1
HexToDec(“a”) => 10
HexToDec(“10”) => 16
HexToDec(“FF”) => 255
HexToDec(“-C”) => -12

MyCode:

using System;

public class Kata
{
  public static int HexToDec(string hexString)
  {
      return hexString.Contains("-") ? Convert.ToInt32(hexString.Substring(1),16) * -1 : Convert.ToInt32(hexString,16);
  }
}

CodeWar:

using System;

public class Kata
{
  public static int HexToDec(string hexString)
  {
    var n = Convert.ToInt32(hexString.Replace("-", ""), 16);
    return hexString.StartsWith("-") ? n * -1 : n;
  }
}