public BigIntegerBC Add(
			BigIntegerBC value)
		{
			if (this.sign == 0)
				return value;

			if (this.sign != value.sign)
			{
				if (value.sign == 0)
					return this;

				if (value.sign < 0)
					return Subtract(value.Negate());

				return value.Subtract(Negate());
			}

			return AddToMagnitude(value.magnitude);
		}
		public BigIntegerBC Subtract(
			BigIntegerBC n)
		{
			if (n.sign == 0)
				return this;

			if (this.sign == 0)
				return n.Negate();

			if (this.sign != n.sign)
				return Add(n.Negate());

			int compare = CompareNoLeadingZeroes(0, magnitude, 0, n.magnitude);
			if (compare == 0)
				return Zero;

			BigIntegerBC bigun, lilun;
			if (compare < 0)
			{
				bigun = n;
				lilun = this;
			}
			else
			{
				bigun = this;
				lilun = n;
			}

			return new BigIntegerBC(this.sign * compare, doSubBigLil(bigun.magnitude, lilun.magnitude), true);
		}