如何用上标的力量用科学计数法格式化数字 [英] How to format numbers in scientific notation with powers in superscript

问题描述

我需要写如下值:

9.6 x 10²
9.6 x 10¹²

我需要知道是否可以在字符串中设置如上所述的数字格式.

I need to know if there is a way to format numbers as above in a string.

推荐答案

作为我上面的评论的后续内容-做这样的事情符合您的要求:

As a follow up to my comment above - does something like this do what you require :

public String FormatAs10Power(decimal val)
{
  string SuperscriptDigits = "\u2070\u00b9\u00b2\u00b3\u2074\u2075\u2076\u2077\u2078\u2079";
  string expstr = String.Format("{0:0.#E0}", val);

  var numparts = expstr.Split('E');
  char[] powerchars = numparts[1].ToArray();
  for (int i = 0; i < powerchars.Length; i++)
  {
    powerchars[i] = (powerchars[i] == '-') ? '\u207b' : SuperscriptDigits[powerchars[i] - '0'];
  }
  numparts[1] = new String(powerchars);
  return String.Join(" x 10",numparts);
}

请参阅: https://dotnetfiddle.net/dX7LAF

根据我上面的评论-数字首先转换为指数格式字符串(在C#中将字符串/整数转换为上标)，再转换回字符串&这两个部分使用"x 10"作为新的分隔符组合.

As per my comment above - the number is first converted to an exponential format string (https://docs.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings#EFormatString), that string is then split on the exponential separator 'E'. The first array is the numeric part, the second the power of 10 to which it is raised - this is converted to superscript characters using one of the techniques of the link I gave (Convert a string/integer to superscript in C#), converted back to a string & the two parts combined using "x 10" as the new separator.

根据您的示例，我假设您希望该值具有一位数的精度，并且不带+号.如果您还有其他需要，可以将格式作为参数传递.上标+的代码是'\ u207A'.这里有一个链接(在撰写本文时)提供上标代码列表: http://unicode.org/charts/PDF/U2070.pdf

I have assumed you want the value to single digit precision as per your example with no preceding + sign. If you need anything else you could pass the format as a parameter. The code for superscript + is '\u207A'. There is a link here (at the time of writing) giving the list of superscript codes : http://unicode.org/charts/PDF/U2070.pdf

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