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[ASP.net教程]C# 高精度加法 支持小数(待优化)


直接上代码

实现思路:

1、首先小数点补 位,9223372036854775808.9+9223372036854775808.9223372036854775808 => 9223372036854775808.900000000000000000+9223372036854775808.9223372036854775808

2、然后开始按位进行计算,进位数放入jw,在下一位计算时加上

  public static char[] Sum(string a, string b)    {      return Sum(a.ToCharArray(), b.ToCharArray());    }    public static char[] Sum(char[] a, char[] b)    {      char[] c = a;//补位后的a      char[] d = b;//补位后的b      int alength = a.Count();//a长度      int blength = b.Count();//b长度      int adot = alength;//a小数点位置      int bdot = blength;//b小数点位置      #region 小数点补位      for (int i = 0; i < alength; i++)      {        if (a[i] == '.')        {          adot = i;          break;        }      }      for (int i = 0; i < blength; i++)      {        if (b[i] == '.')        {          bdot = i;          break;        }      }      if (adot != alength || bdot != blength)      {        if (adot == alength)        {          c = new char[alength + 1 + blength - bdot - 1];          for (int i = 0; i < c.Length; i++)          {            if (i < alength)            {              c[i] = a[i];            }            else if (i == alength)            {              c[i] = '.';            }            else            {              c[i] = '0';            }          }        }        else if (bdot == blength)        {          d = new char[blength + 1 + alength - adot - 1];          for (int i = 0; i < d.Length; i++)          {            if (i < blength)            {              d[i] = b[i];            }            else if (i == blength)            {              d[i] = '.';            }            else            {              d[i] = '0';            }          }        }        else        {          if (alength - adot > blength - bdot)          {            d = new char[blength + ((alength - adot) - (blength - bdot))];            for (int i = 0; i < d.Length; i++)            {              if (i < blength)              {                d[i] = b[i];              }              else              {                d[i] = '0';              }            }          }          else          {            c = new char[alength + ((blength - bdot) - (alength - adot))];            for (int i = 0; i < c.Length; i++)            {              if (i < alength)              {                c[i] = a[i];              }              else              {                c[i] = '0';              }            }          }        }      }      #endregion      List<char> item = new List<char>();      int cl = c.Length;      int dl = d.Length;      int r = 0;      int jw = 0;//进位      do      {        if (cl > 0 && dl > 0)        {          if (c[cl - 1] == '.')          {            r = '.';          }          else          {            r = (int)c[cl - 1] + (int)d[dl - 1] - 96 + jw;            jw = 0;            if (r >= 10)            {              jw++;              r = r - 10;            }          }        }        else if (cl <= 0 && dl > 0)        {          r = d[dl - 1] - 48;        }        else if (cl > 0 && dl <= 0)        {          r = c[cl - 1] - 48;        }        if (r == 46)        {          item.Add(Convert.ToChar(r));        }        else        {          item.Add(Convert.ToChar(r.ToString()));        }        cl--; dl--;      } while (cl > 0 || dl > 0);      if (jw == 1)      {        item.Add('1');      }      return item.ToArray();    }