Василий Банников

struct ExponentialInteger
{   
    private readonly int value;
    private readonly int exp;
    
    //.ctor
    // operator +
    // operator -
    // operator *
    // operator /
    // operator implicit
    // operator explicit
    // IEquatable, IComparable, IFormattable
    // итд
    private static string[] suffix = new[]
    {
        "", "K", "M", "t", "q", "Q", "s", "S", "o", "n", "d", "U", "D", "T", "Qt", "Qd", "Sd", "St", "O", "N", "v", "c"
    };

    public override string ToString()
    {
        if (exp >= suffix.Length || exp < 0)
        {
            return $"{value}*10^{exp}";
        }
        else
        {
            return $"{value}{suffix[exp]}";
        }
    }
}