/// <summary>
/// Adds the values of an Integer and another Integer.
/// </summary>
/// <param name="right">The value to add.</param>
/// <returns>The sum of the Integer and right.</returns>
public Integer Add(Integer right)
{
if (right.length == 0)
{
return(Plus());
}
if (sign != right.sign)
{
return(Subtract(right.Negate()));
}
var result = length < right.length
? Calc.Add(right.bits, right.length, bits, length)
: Calc.Add(bits, length, right.bits, right.length);
return(new Integer(result, result.Length, sign));
}
/// <summary>
/// Subtracts an Integer from another Integer.
/// </summary>
/// <param name="right">The value to subtract.</param>
/// <returns>
/// The result of subtracting right from the Integer.
/// </returns>
public Integer Subtract(Integer right)
{
if (right.length == 0)
{
return(Plus());
}
if (sign != right.sign)
{
return(Add(right.Negate()));
}
var diff = Bits.Compare(bits, length, right.bits, right.length);
var result = diff < 0
? Calc.Subtract(right.bits, right.length, bits, length)
: Calc.Subtract(bits, length, right.bits, right.length);
return(new Integer(result, result.Length, diff < 0 ? !sign : sign));
}