How to format numbers in scientific notation with powers in superscript

Question

I need to write values like:

9.6 x 10²
9.6 x 10¹²

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

Answer 1

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);
}

See : https://dotnetfiddle.net/dX7LAF

As per my comment above - the number is first converted to an exponential format string (https://learn.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.

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