///<summary>
///</summary>
///<param name="number"></param>
///<returns></returns>
public BigNumber Multiply(BigNumber number)
{
if (numberState == NumberState.None) {
if (number.numberState == 0)
return new BigNumber(NumberState.None, bigDecimal.Multiply(number.bigDecimal));
return new BigNumber(number.numberState, null);
}
return new BigNumber(numberState, null);
}
///<summary>
///</summary>
///<param name="number"></param>
///<returns></returns>
public BigNumber Subtract(BigNumber number)
{
if (numberState == NumberState.None) {
if (number.numberState == NumberState.None)
return new BigNumber(NumberState.None, bigDecimal.Subtract(number.bigDecimal));
return new BigNumber(number.InverseState, null);
}
return new BigNumber(numberState, null);
}
public BigNumber Modulus(BigNumber number)
{
if (numberState == 0) {
if (number.numberState == 0) {
BigDecimal div_by = number.bigDecimal;
if (div_by.CompareTo(BdZero) != 0) {
BigDecimal remainder = bigDecimal.Remainder(div_by);
return new BigNumber(NumberState.None, remainder);
}
}
}
return new BigNumber(NumberState.NotANumber, null);
}
///<summary>
///</summary>
///<param name="number"></param>
///<returns></returns>
public BigNumber Divide(BigNumber number)
{
if (numberState == 0) {
if (number.numberState == 0) {
BigDecimal div_by = number.bigDecimal;
if (div_by.CompareTo (BdZero) != 0) {
return new BigNumber(NumberState.None, bigDecimal.Divide(div_by, 10, RoundingMode.HalfUp));
}
}
}
// Return NaN if we can't divide
return new BigNumber(NumberState.NotANumber, null);
}
/**
* Compares this BigNumber with the given BigNumber. Returns 0 if the values
* are equal, >0 if this is greater than the given value, and < 0 if this
* is less than the given value.
*/
public int CompareTo(BigNumber number)
{
if (this == number) {
return 0;
}
// If this is a non-infinity number
if (numberState == 0) {
// If both values can be represented by a long value
if (CanBeLong && number.CanBeLong) {
// Perform a long comparison check,
if (long_representation > number.long_representation)
return 1;
if (long_representation < number.long_representation)
return -1;
return 0;
}
// And the compared number is non-infinity then use the BigDecimal
// compareTo method.
if (number.numberState == 0)
return bigDecimal.CompareTo(number.bigDecimal);
// Comparing a regular number with a NaN number.
// If positive infinity or if NaN
if (number.numberState == NumberState.PositiveInfinity ||
number.numberState == NumberState.NotANumber) {
return -1;
}
// If negative infinity
if (number.numberState == NumberState.NegativeInfinity)
return 1;
throw new ApplicationException("Unknown number state.");
}
// This number is a NaN number.
// Are we comparing with a regular number?
if (number.numberState == NumberState.None) {
// Yes, negative infinity
if (numberState == NumberState.NegativeInfinity)
return -1;
// positive infinity or NaN
if (numberState == NumberState.PositiveInfinity ||
numberState == NumberState.NotANumber) {
return 1;
}
throw new ApplicationException("Unknown number state.");
}
// Comparing NaN number with a NaN number.
// This compares -Inf less than Inf and NaN and NaN greater than
// Inf and -Inf. -Inf < Inf < NaN
return (numberState - number.numberState);
}
// ---- Mathematical functions ----
///<summary>
///</summary>
///<param name="number"></param>
///<returns></returns>
public BigNumber BitWiseOr(BigNumber number)
{
if (numberState == NumberState.None && Scale == 0 &&
number.numberState == 0 && number.Scale == 0) {
BigInteger bi1 = bigDecimal.ToBigInteger();
BigInteger bi2 = number.bigDecimal.ToBigInteger();
return new BigNumber(NumberState.None, new BigDecimal(bi1.Or(bi2)));
}
return null;
}
///<summary>
///</summary>
///<param name="number"></param>
///<returns></returns>
public BigNumber Add(BigNumber number)
{
if (numberState == NumberState.None) {
if (number.numberState == NumberState.None)
return new BigNumber(NumberState.None, bigDecimal.Add(number.bigDecimal));
return new BigNumber(number.numberState, null);
}
return new BigNumber(numberState, null);
}
