rational.h

本程序为visual c++课件讲义

// rational.h: declaration of Rational ADT
#ifndef RATIONAL_H
#define RATIONAL_H

#include <iostream>
using namespace std;
// Rational ADT: class description
class Rational {
    public: // emeber functions
        // default constructor
        Rational();
        
        // a second constructor
        Rational(int number, int denom=1);
        
        // destructor
        ~Rational();
        
        // copy constructor
        Rational(const Rational &r);
        
        // member assignment
        Rational& operator=(const Rational &r);
        // can it be: void operator=(const Rational &r); ?????
        
        
        
        // some arithmetic and stream facilitators
        Rational Add(const Rational &r) const;
        Rational Sub(const Rational &r) const;
        Rational Multiply(const Rational &r) const;
        Rational Divide(const Rational &r) const;
        void Insert(ostream &sout) const;
        void Extract(istream &sin);
        
    protected:
        // inspectors
        int GetNumerator() const;
        int GetDenominator() const;
        
        // mutators
        void SetNumerator(int numer);
        void SetDenominator(int denom);
        
    private:
        // data members
        int NumeratorValue;
        int DenominatorValue;
};
// Rational ADT: auxiliary operator description
Rational operator+(const Rational &r, const Rational &s);
Rational operator-(const Rational &r, const Rational &s);
Rational operator*(const Rational &r, const Rational &s);
Rational operator/(const Rational &r, const Rational &s);

ostream& operator<<(ostream &sout, const Rational &s);
istream& operator>>(istream &sin, Rational &r);
// can they be: void operator<<(ostream &sout, const Rational &); ?????

#endif