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- #ifndef FRACTION_H
- #define FRACTION_H
-
- /*$Header: /afs/alw.nih.gov/unix/sun4_40c/usr/local/src/nihcl-3.0/share/lib/RCS/Fraction.h,v 3.0 90/05/20 00:19:40 kgorlen Rel $*/
-
- /* Fraction.h -- declarations for fractions
-
- THIS SOFTWARE FITS THE DESCRIPTION IN THE U.S. COPYRIGHT ACT OF A
- "UNITED STATES GOVERNMENT WORK". IT WAS WRITTEN AS A PART OF THE
- AUTHOR'S OFFICIAL DUTIES AS A GOVERNMENT EMPLOYEE. THIS MEANS IT
- CANNOT BE COPYRIGHTED. THIS SOFTWARE IS FREELY AVAILABLE TO THE
- PUBLIC FOR USE WITHOUT A COPYRIGHT NOTICE, AND THERE ARE NO
- RESTRICTIONS ON ITS USE, NOW OR SUBSEQUENTLY.
-
- Author:
- K. E. Gorlen
- Computer Systems Laboratory, DCRT
- National Institutes of Health
- Bethesda, MD 20892
-
- $Log: Fraction.h,v $
- * Revision 3.0 90/05/20 00:19:40 kgorlen
- * Release for 1st edition.
- *
- */
-
- #include "Object.h"
-
- class Fraction: public VIRTUAL Object {
- DECLARE_MEMBERS(Fraction);
- public: // static member functions
- static int gcd(int uu, int vv);
- private:
- int n,d;
- Fraction(int num, int den, int dum) {
- n = (dum,num); d = den;
- }
- void parseFraction(istream&);
- void reduce();
- protected: // storer() functions for object I/O
- virtual void storer(OIOofd&) const;
- virtual void storer(OIOout&) const;
- public:
- Fraction(int num =0, int den =1);
- Fraction(double);
- Fraction(istream&);
- operator double() const { return (double)n/d; }
- int denominator() const { return d; }
- int numerator() const { return n; }
-
- friend Fraction operator+(const Fraction&, const Fraction&);
- friend Fraction operator-(const Fraction& u) { return Fraction(-u.n,u.d); }
- friend Fraction operator-(const Fraction&, const Fraction&);
- friend Fraction operator*(const Fraction&, const Fraction&);
- friend Fraction operator/(const Fraction&, const Fraction&);
- friend bool operator<(const Fraction& u, const Fraction& v);
- friend bool operator>(const Fraction& u, const Fraction& v) { return v<u; }
- friend bool operator<=(const Fraction& u, const Fraction& v);
- friend bool operator>=(const Fraction& u, const Fraction& v) { return v<=u; }
- friend bool operator==(const Fraction& u, const Fraction& v) { return u.n == v.n && u.d == v.d; }
- friend bool operator!=(const Fraction& u, const Fraction& v) { return !(u==v); }
-
- void operator+=(const Fraction& u) { *this = *this + u; }
- void operator-=(const Fraction& u) { *this = *this - u; }
- void operator*=(const Fraction& u) { *this = *this * u; }
- void operator/=(const Fraction& u) { *this = *this / u; }
-
- bool between(const Fraction& min, const Fraction& max) const;
- Fraction max(const Fraction&) const;
- Fraction min(const Fraction&) const;
-
- virtual int compare(const Object&) const;
- virtual void deepenShallowCopy(); // {}
- virtual unsigned hash() const;
- virtual bool isEqual(const Object&) const;
- virtual void printOn(ostream& strm =cout) const;
- virtual void scanFrom(istream& strm);
- virtual const Class* species() const;
- };
-
- #endif
-