public static VeryBigInteger operator *(VeryBigInteger a, int coeff)
{
if (coeff > Math.Pow(10, power))
{
Console.WriteLine("Can not multiply");
return a;
}
if (coeff == 0) return new VeryBigInteger(1);
VeryBigInteger result = new VeryBigInteger(a.digits.Count + 1);
for (int i = 0; i < a.digits.Count; i++)
{
result.digits[i] += a.digits[i] * coeff;
if (result.digits[i].ToString().Length > power)
{
result.digits[i + 1] = result.digits[i] / (int)Math.Pow(10, power);
result.digits[i] = result.digits[i] % (int)Math.Pow(10, power);
}
}
ClearNulls(result);
if (coeff < 0 || a.sign == false)
{
result.sign = false;
}
return result;
}
static void Main(string[] args)
{
VeryBigInteger bi = new VeryBigInteger("1056456346");
VeryBigInteger bi2 = new VeryBigInteger("-203463463463463");
VeryBigInteger res = bi * bi2;
Console.WriteLine(res);
Console.ReadLine();
}
public static VeryBigInteger operator *(VeryBigInteger a, VeryBigInteger b)
{
VeryBigInteger result = new VeryBigInteger(a.digits.Count * b.digits.Count);
VeryBigInteger temp = new VeryBigInteger(a.digits.Count);
bool bsign = b.sign;
bool asign = a.sign;
a.sign = true;
b.sign = true;
if (a < b)
{
temp = a;
a = b;
b = temp;
}
for (int i = 0; i < b.digits.Count; i++)
{
temp = a * b.digits[i];
for (int j = 0; j < i; j++)
{
temp.digits.Insert(0, 0);
}
result += temp;
}
ClearNulls(result);
if (bsign == false || asign == false)
{
result.sign = false;
}
a.sign = asign;
b.sign = bsign;
return result;
}
private static int SameLength(VeryBigInteger a, VeryBigInteger b)
{
if (a.digits.Count > b.digits.Count)
{
while (a.digits.Count != b.digits.Count)
{
b.digits.Add(0);
}
}
if (b.digits.Count > a.digits.Count)
{
while (a.digits.Count != b.digits.Count)
{
a.digits.Add(0);
}
}
return a.digits.Count;
}
private static void ClearNulls(VeryBigInteger a)
{
for (int i = a.digits.Count - 1; i >= 0; i--)
{
if (a.digits[i] != 0) break;
a.digits.RemoveAt(i);
}
}
public static VeryBigInteger operator -(VeryBigInteger a, VeryBigInteger b)
{
int maxListSize = SameLength(a, b);
VeryBigInteger result = new VeryBigInteger(maxListSize);
if (a.sign == false && b.sign)
{
VeryBigInteger temp = b;
temp.sign = false;
return a + temp;
}
if (b.sign == false && a.sign)
{
{
VeryBigInteger temp = b;
temp.sign = false;
return a + temp;
}
}
if (b.sign == false && a.sign == false)
{
{
VeryBigInteger temp1 = b;
temp1.sign = true;
VeryBigInteger temp2 = a;
temp2.sign = true;
return temp1-temp2;
}
}
if (a < b)
{
VeryBigInteger temp;
temp = a;
a = b;
b = temp;
result.sign = false;
}
for (int i = 0; i < maxListSize; i++)
{
if (a.digits[i] < b.digits[i])
{
for (int j = i + 1; j < maxListSize; j++)
{
if (a.digits[j] != 0)
{
a.digits[j] -= 1;
break;
}
a.digits[j] = 9999;
}
result.digits[i] = (int)Math.Pow(10, power) + a.digits[i] - b.digits[i];
}
else
{
result.digits[i] = a.digits[i] - b.digits[i];
}
}
for (int i = maxListSize - 1; i > 0; i--)
{
if (result.digits[i] == 0)
{
result.digits.RemoveAt(i);
}
}
ClearNulls(result);
return result;
}
public static VeryBigInteger operator +(VeryBigInteger a, VeryBigInteger b)
{
int maxListSize = SameLength(a, b);
VeryBigInteger result = new VeryBigInteger(maxListSize + 1);
if (a.sign == false && b.sign)
{
return b - a;
}
if (b.sign == false && a.sign)
{
return a + b;
}
if (a.sign == false && b.sign == false)
{
result.sign = false;
}
for (int i = 0; i < maxListSize; i++)
{
result.digits[i] += a.digits[i] + b.digits[i];
if (result.digits[i] >= Math.Pow(10, power))
{
result.digits[i] -= (int)Math.Pow(10, power);
result.digits[i + 1] += 1;
}
}
ClearNulls(result);
return result;
}
