source file of the Flower Library
- (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+ (c) 1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
#include "arithmetic-operator.hh"
#include "fproto.hh"
+/**
+ Rational numbers. Included is support for + and - infinity.
+ */
class Rational {
+ /**
+ Sign of rational.
+ -2, .. 2
+
+ -2,2 is - and + infinity.
+ -1,1 is negative and positive.
+ 0 if *this is zero.
+ */
int sign_;
unsigned int num_, den_;
void normalise ();
void copy (Rational const &);
+
public:
void set_infinite (int sign);
bool infty_b () const;
void invert ();
int num () const { return sign_ * num_; }
int den () const { return den_; }
+ int num_i () const { return sign_ * num_; }
+ int den_i () const { return den_; }
Rational truncated () const;
void negate ();
operator bool () const;
- operator String () const;
+ operator int () const;
+ operator double () const;
Rational operator - () const;
+ /**
+ Initialize to 0.
+ */
Rational ();
Rational (int, int =1);
Rational (double);
Rational &operator = (Rational const &);
Rational &operator *= (Rational);
- Rational &operator /= (Rational);
- Rational &operator += (Rational);
- Rational &operator -= (Rational);
+ Rational &operator /= (Rational);
+ Rational &operator += (Rational);
+ Rational &operator -= (Rational);
static int compare (Rational const&, Rational const&);
int sign () const;
String str () const;