public static BigInt operator *(BigInt V1, BigInt V2) // v1 * v2
{
V1.DeleteNuls(); V2.DeleteNuls();
var result = new BigInt();
result.EqualizeTheDigits(V1.number.Count + V2.number.Count);
V1.number.Reverse(); V2.number.Reverse();
for (var i = 0; i < V1.number.Count; ++i)
{
for (int j = 0, carry = 0; j < V2.number.Count || carry > 0; ++j)
{
var cur = result.number[i + j] + V1.number[i] * (j < V2.number.Count ? V2.number[j] : 0) + carry;
result.number[i + j] = cur % 10;
carry = cur / 10;
}
}
while (result.number.Count > 1 && result.number.Last() == 0)
{
result.number.RemoveAt(result.number.Count - 1);
}
result.sign = V1.sign == V2.sign ? '+' : '-';
V1.number.Reverse(); V2.number.Reverse();
result.number.Reverse();
result.DeleteNuls();
return(result);
}