public VeryLong Multiply(VeryLong other)
{
int numberDecimalPlaces = GetDecimalPlaces();
int numberDecimalPlacesOther = other.GetDecimalPlaces();
int resultDecialPlaces = numberDecimalPlaces + numberDecimalPlacesOther;
other = RemoveDecimalPlaces(other);
string integerStringCopy = _integerString;
_integerString = _integerString.Replace(".", "");
List <string> multiplicationResults = new List <string>();
string multiplicationResult = GetZeros(1);
int currentLastDigit = 0;
int currentLastDigitOther = 0;
int resultDigit = 0;
int behalte = 0;
int mult = 0;
int indexOther = 0;
int index = 0;
while (Length() > index)
{
indexOther = 0;
behalte = 0;
multiplicationResult = GetZeros(index);
while (other.Length() > indexOther || behalte != 0)
{
currentLastDigit = int.Parse(GetLastDigit(index));
currentLastDigitOther = int.Parse(other.GetLastDigit(indexOther));
mult = currentLastDigit * currentLastDigitOther + behalte;
behalte = mult / 10;
resultDigit = mult % 10;
multiplicationResult = multiplicationResult.Insert(0, resultDigit.ToString());
indexOther++;
}
index++;
multiplicationResults.Add(multiplicationResult);
}
VeryLong mainResult = VeryLong.AddSummands(multiplicationResults);
mainResult.SetDecimalPlaces(resultDecialPlaces);
mainResult.RemoveLeadingZeros();
_integerString = integerStringCopy;
return(mainResult);
}