static bool IsFirstIntegerSmaller(LargeInteger firstLongInteger, LargeInteger secondLongInteger)
{
bool smaller = false;
if (Convert.ToInt32(firstLongInteger.ToString()[0]) <= Convert.ToInt32(secondLongInteger.ToString()[0]))
{
int i;
if (Convert.ToInt32(firstLongInteger.ToString()[0]) < Convert.ToInt32(secondLongInteger.ToString()[0]))
{
i = 0;
}
else
{
i = 1;
}
for (; i < firstLongInteger.Length;)
{
if (Convert.ToInt32(firstLongInteger.ToString()[i]) >= Convert.ToInt32(secondLongInteger.ToString()[i]))
{
smaller = false;
return(false);
}
else
{
smaller = true;
return(true);
}
}
}
else
{
smaller = false;
return(false);
}
return(smaller);
}
public static LargeInteger operator /(LargeInteger firstLongInteger, LargeInteger secondLongInteger)
{
var diff = Math.Abs(firstLongInteger.Length - secondLongInteger.Length);
LargeInteger difference = new LargeInteger();
LargeInteger multiplyer = secondLongInteger;
LargeInteger subtractionResult = firstLongInteger;
LargeInteger sumFinalResult = new LargeInteger();
if (firstLongInteger.ToString().Equals("0") || secondLongInteger.ToString().Equals("0"))
{
throw new DivideByZeroException("You can't divide by 0!");
}
if (firstLongInteger.Length < secondLongInteger.Length)
{
throw new NotSupportedException("Second long integer is bigger than first long integer! Result is 0!");
}
if (secondLongInteger.Length == 1 && secondLongInteger.ToString().Equals("1"))
{
return(firstLongInteger);
}
if (firstLongInteger.Length == secondLongInteger.Length)
{
if (IsFirstIntegerSmaller(firstLongInteger, secondLongInteger) == true)
{
throw new ArgumentException("First integer is smaller than second number!");
}
}
while (subtractionResult.Length >= secondLongInteger.Length)
{
if (subtractionResult.Length == secondLongInteger.Length && subtractionResult.ToString()[0] < secondLongInteger.ToString()[0])
{
break;
}
if (subtractionResult.Length > secondLongInteger.Length)
{
if (subtractionResult.ToString().First() > secondLongInteger.ToString().First())
{
diff = Math.Abs(subtractionResult.Length - secondLongInteger.Length);
}
else
{
diff = Math.Abs(subtractionResult.Length - secondLongInteger.Length) - 1;
}
difference = new LargeInteger("1" + GenerateZeroes(diff));
multiplyer = secondLongInteger * difference;
subtractionResult = subtractionResult - multiplyer;
sumFinalResult += difference;
}
else
{
if (IsFirstIntegerSmaller(subtractionResult, secondLongInteger) == false)
{
difference = new LargeInteger("1");
subtractionResult = subtractionResult - secondLongInteger;
sumFinalResult += difference;
}
else
{
break;
}
}
}
return(sumFinalResult);
}