public void Multiply(LargeNumber secondNum)
{
List <int> helpList = new List <int>();
if ((Negative && secondNum.Negative) || (!Negative && !secondNum.Negative))
{
Negative = false;
}
else if ((!Negative && secondNum.Negative) || (Negative && !secondNum.Negative))
{
Negative = true;
}
Array.Reverse(Number);
for (int i = 0; i < secondNum.Number.Length; i++)
{
for (int j = 0; j < Number.Length; j++)
{
if (i == 0)
{
helpList.Add(secondNum.Number[i] * Number[j]);
}
else
{
if (i + j >= helpList.Count)
{
helpList.Add(secondNum.Number[i] * Number[j]);
}
else
{
helpList[i + j] += secondNum.Number[i] * Number[j];
}
}
}
}
Number = CutLargeValue(helpList).ToArray();
Array.Reverse(Number);
}
public void Add(LargeNumber secondNum)
{
int lengthOfLargest, smallestLength;
bool ourNumSmaller;
List <int> helpList = new List <int>();
Array.Reverse(Number);
if (Number.Length >= secondNum.Number.Length)
{
lengthOfLargest = Number.Length;
smallestLength = secondNum.Number.Length;
ourNumSmaller = false;
}
else
{
lengthOfLargest = secondNum.Number.Length;
smallestLength = Number.Length;
ourNumSmaller = true;
}
for (int i = 0; i < lengthOfLargest; i++)
{
if (i < smallestLength)
{
helpList.Add(Number[i] + secondNum.Number[i]);
}
else if (ourNumSmaller)
{
helpList.Add(secondNum.Number[i]);
}
else if (!ourNumSmaller)
{
helpList.Add(Number[i]);
}
}
Number = CutLargeValue(helpList).ToArray();
Array.Reverse(Number);
}
public void Substract(LargeNumber secondNum)
{
int lengthOfLargest = 0, smallestLength = 0;
int ourNumSmaller = 0;
List <int> helpList = new List <int>();
Array.Reverse(Number);
if (Number.Length == secondNum.Number.Length)
{
for (int i = Number.Length - 1; i >= 0; i--)
{
if (CheckSmaller(secondNum.Number[i], Number[i]))
{
lengthOfLargest = Number.Length;
smallestLength = Number.Length;
ourNumSmaller = -1;
break;
}
else if (CheckSmaller(Number[i], secondNum.Number[i]))
{
lengthOfLargest = Number.Length;
smallestLength = Number.Length;
ourNumSmaller = 1;
break;
}
if (i == 0)
{
Number = new int[] { 0 };
return;
}
}
if (ourNumSmaller == 1)
{
for (int j = 0; j < lengthOfLargest; j++)
{
if (CheckSmaller(Number[j], secondNum.Number[j]))
{
Number[j] += 10;
Number[j + 1] = Number[j + 1] - 1;
helpList.Add(Number[j] - secondNum.Number[j]);
}
else
{
helpList.Add(Number[j] - secondNum.Number[j]);
}
}
}
else
{
for (int j = 0; j < lengthOfLargest; j++)
{
if (Number[j] <= secondNum.Number[j])
{
helpList.Add(secondNum.Number[j] - Number[j]);
}
else
{
secondNum.Number[j] += 10;
secondNum.Number[j + 1] -= 1;
helpList.Add(secondNum.Number[j] - Number[j]);
}
}
}
}
else if (Number.Length > secondNum.Number.Length)
{
lengthOfLargest = Number.Length;
smallestLength = secondNum.Number.Length;
ourNumSmaller = -1;
for (int j = 0; j < smallestLength; j++)
{
if (Number[j] >= secondNum.Number[j])
{
helpList.Add(Number[j] - secondNum.Number[j]);
}
else
{
Number[j] += 10;
Number[j + 1] -= 1;
helpList.Add(Number[j] - secondNum.Number[j]);
}
}
for (int j = smallestLength; j < lengthOfLargest; j++)
{
helpList.Add(Number[j]);
}
}
else
{
lengthOfLargest = secondNum.Number.Length;
smallestLength = Number.Length;
ourNumSmaller = 1;
for (int j = 0; j < smallestLength; j++)
{
if (Number[j] <= secondNum.Number[j])
{
helpList.Add(secondNum.Number[j] - Number[j]);
}
else
{
secondNum.Number[j] += 10;
secondNum.Number[j + 1] -= 1;
helpList.Add(secondNum.Number[j] - Number[j]);
}
}
for (int j = smallestLength; j < lengthOfLargest; j++)
{
helpList.Add(secondNum.Number[j]);
}
}
Number = CutLargeValue(helpList).ToArray();
Array.Reverse(Number);
}
public LargeNumber(LargeNumber inputNumber)
{
Number = inputNumber.Number;
Negative = inputNumber.Negative;
}