Question

I have string “H20” (chemical formula for water). I would like to change it so that all the numbers in the string would be small (the number 2 would be small index next to the letter H). How can I do that?

Answer 1

Assuming that you have the means of displaying the subscript unicode characters, you could easily write your own extension method for subscripting:

public static string Subscript(this string normal)
{
    if(normal == null) return normal;

    var res = new StringBuilder();
    foreach(var c in normal)
    {
        char c1 = c;

        // I'm not quite sure if char.IsDigit(c) returns true for, for example, '³',
        // so I'm using the safe approach here
        if (c >= '0' && c <= '9')
        {
            // 0x208x is the unicode offset of the subscripted number characters
            c1 = (char)(c - '0' + 0x2080);
        }
        res.Append(c1);
    }

    return res.ToString();
}