Rational.h

[Quezacot (不～～～我的普化)]

---------------------------------rational.h----------------------------------

#ifndef RATIONAL_H
#define RATIONAL_H

class Rational{
public:
        Rational();
        void setRational(int,int);
        Rational addition(Rational,Rational);
        Rational subtraction(Rational,Rational);
        Rational multiplication(Rational,Rational);
        Rational division(Rational,Rational);
        void printfraction();
        void printfloat();
private:
        int calgcd(int,int);
        int numerator;
        int denominator;
};

#endif

--------------------------------rational.cpp---------------------------------

#include<iostream>
using std::cin;
using std::cout;
using std::endl;

#include<cmath>

#include "Rational.h"

Rational::Rational(){numerator=denominator=1;}

void Rational::setRational(int n,int d)
{
        if (d==0){
                cout<<"denominator can't be zero!!"<<endl;
                return;
        }
        if (n*d<0) { n=-fabs(n); d=fabs(d); }
        else { n=fabs(n); d=fabs(d); }
        int gcd=calgcd(fabs(n),fabs(d));
        numerator=n/gcd;
        denominator=d/gcd;
}

Rational Rational::addition(Rational a,Rational b)
{
        int n=a.numerator*b.denominator+b.numerator*a.denominator;
        Rational c;
        c.setRational(n,a.denominator*b.denominator);
        return c;
}

Rational Rational::subtraction(Rational a,Rational b)
{
        int n=a.numerator*b.denominator-b.numerator*a.denominator;
        Rational c;
        c.setRational(n,a.denominator*b.denominator);
        return c;
}

Rational Rational::multiplication(Rational a,Rational b)
{
        Rational c;
        c.setRational(a.numerator*b.numerator,a.denominator*b.denominator);
        return c;
}

Rational Rational::division(Rational a,Rational b)
{
        Rational c;
        c.setRational(a.numerator*b.denominator,a.denominator*b.numerator);
        return c;
}

void Rational::printfraction()
{
        cout<<numerator<<"/"<<denominator;
}

void Rational::printfloat()
{
        cout<<static_cast<float>(numerator)/denominator;
}

int Rational::calgcd(int d1,int d2)
{
        int tem;
        while(d1){
                tem=d1;
                d1=d2%d1;
                d2=tem;
        }
        return d2;
}

///////////////////////////////////////////////////////////////////////

int main()
{
   int an,ad,bn,bd;
   Rational fa,fb;
   cout<<"Please enter one fraction fa (numerator-denominator)."<<endl;
   cin>>an>>ad;
   fa.setRational(an,ad);
   cout<<"Please enter another fraction fb (numerator-denominator)."<<endl;
   cin>>bn>>bd;
   fb.setRational(bn,bd);
   cout<<"fa = ";fa.printfraction();cout<<endl;
   cout<<"fb = ";fb.printfraction();cout<<endl;
   int c;
   do{
     Rational fc;
     cout<<"Enter a choice:"<<endl;
     cout<<"  0  Caculate fa + fb "<<endl;
     cout<<"  1  Caculate fa - fb "<<endl;
     cout<<"  2  Caculate fa * fb "<<endl;
     cout<<"  3  Caculate fa / fb "<<endl;
     cout<<"  4  Print fa in floating-point format"<<endl;
     cout<<"  5  Print fb in floating-point format"<<endl;
     cout<<"  6  End program"<<endl;
     cin>>c;
       switch(c){
        case 0: fa.printfraction();cout<<" + ";fb.printfraction();cout<<" = ";
                fc=fc.addition(fa,fb);fc.printfraction();cout<<endl;break;
        case 1: fa.printfraction();cout<<" - ";fb.printfraction();cout<<" = ";
                fc=fc.subtraction(fa,fb);fc.printfraction();cout<<endl;break;
        case 2: fa.printfraction();cout<<" * ";fb.printfraction();cout<<" = ";
                fc=fc.multiplication(fa,fb);fc.printfraction();cout<<endl;break;
        case 3: fa.printfraction();cout<<" / ";fb.printfraction();cout<<" = ";
                fc=fc.division(fa,fb);fc.printfraction();cout<<endl;break;
        case 4: fa.printfraction();cout<<" = ";fa.printfloat();cout<<endl;break;
        case 5: fb.printfraction();cout<<" = ";fb.printfloat();cout<<endl;break;
       }
   }while(c!=6);
   return 0;
}

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