[c++]rational

[ugoc (歷史都不歷史了)]

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

# ifndef RAITONAL_H
# define RATIONAL_H
using namespace std;

class rational{
public:
   rational();
   void set (int,int);
   double dbget ();
   void get ();
   int getn ();
   int getd ();
private:
   int numerator;
   int denominator;

};

int fhcm (int, int);
rational set (int, int);
rational add (rational,rational);
rational product (rational,rational);
rational divide (rational,rational);

#endlif

-------------------------------manipulate.cpp--------------------------------

#include <iostream>
#include "rational.h"
using namespace std;

void main()
{
   int f1n,f1d,f2n,f2d;
   rational f1,f2;
   cout<<"set f1-numerator:";
   cin>>f1n;
   cout<<"set f1-denominator:";
   cin>>f1d;
   cout<<"set f2-numerator:";
   cin>>f2n;
   cout<<"set f2-denominator:";
   cin>>f2d;

   f1.set(f1n,f1d);
   f2.set(f2n,f2d);
   cout<<"f1=";
   f1.get();
   cout<<"\nf2=";
   f2.get();
}

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

#include <iostream>
using namespace std;
#include "rational.h"

inline rational::rational (){set(1,1);};

void rational::set(int n, int d)
{
   if (!d)cout<<"error:cn't set denominator 0";
   else {
      int hcm=fhcm (n,d);
      numerator=n/hcm;
      denominator=d/hcm;
   }
}

double rational::dbget ()
{
   return numerator/denominator;
}

void rational::get ()
{
   cout<<numerator<<"/"<<denominator<<endl;
}

int rational::getn ()
{
return numerator;
}

int rational::getd ()
{
return denominator;
}

//--------------------------------------------------------------------------

int fhcm (int a,int b)
{
   return (a==0)?b:fhcm(b%a,a);
}

rational add (rational a, rational b)
{
   rational ans;
   int hcm=fhcm (a.getd(),b.getd());
   int lcd=a.getd()*b.getd()/hcm;
   ans.set(a.getn()*lcd/a.getd()+b.getn()*lcd/b.getd(), lcd);
   return ans;
}

rational product (rational a, rational b)
{
   rational ans;
   ans.set(a.getn()*b.getn(),a.getd()*b.getd());
   return ans;
}

rational divide (rational a, rational b)
{
   rational ans;
   ans.set(a.getn()*b.getd(),a.getd()*b.getn());
   return ans;
}

--
其實有一些改變
加上了一些功能
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