Rational (gb.gmp)
This class represents a rational number, i.e. a 
BigInt number divided by another BigInt number.
It implements standard arithmetic and comparison operators (i.e. 
+, 
-, 
*, 
/, 
^, 
Abs, 
=, 
<>, 
<, 
>, 
<=, 
>=), and provides automatic
conversions with 
BigInt and native Gambas numerical datatypes.
Static methods
| 
FromString  
 | 
Convert a string into a rational number.
 | 
Properties
| 
Den  
 | 
Return or set the rational denominator.
 | 
| 
Num  
 | 
Return or set the rational numerator.
 | 
Methods
| 
ToString  
 | 
Convert the rational number to its string representation.
 |