bruch

gistfile1.cpp

#include <iostream>
#include <iomanip>

using namespace std;

class Bruch
{
private:
	long long zaehler;
	long long nenner;
	int euclied(long long a, long long b)
	{
		while(b != 0)
		{
			int h = a % b;
			a = b;
			b = h;
		}
		return a;
	}
	void kuerzen()
	{
		long long x;
		do
		{
			x = euclied(zaehler, nenner);
			zaehler /= x;
			nenner /= x;
		}
		while(x != 1);
	}
public:
	Bruch(long long zaehler = 0, long long nenner = 1)
	{
		setBruch(zaehler, nenner);
	}
	Bruch(double zahl)
	{
		setBruch(zahl);
	}
	void setBruch(double zahl, int genauigkeit)
	{
		long long faktor = pow(10.0, genauigkeit);
		setZaehler((long long)(zahl*faktor+5/faktor));
		setNenner(faktor);
		kuerzen();
	}
	void setBruch(long long zaehler = 0, long long nenner = 1)
	{
		this->zaehler = zaehler;
		this->nenner = nenner;
		kuerzen();
	}
	void setZaehler(long long zaehler)
	{
		this->zaehler = zaehler;
	}
	void setNenner(long long nenner)
	{
		if(!nenner)
			nenner = 1;
		this->nenner = nenner;
	}
	double getDouble()
	{
		return (double)zaehler/(double)nenner;
	}
	long long getZaehler()
	{
		return zaehler;
	}
	long long getNenner()
	{
		return nenner;
	}
};

int main()
{
	Bruch myBruch;
	myBruch.setBruch(15.1321, 1);

	cout << myBruch.getZaehler() << "/" << myBruch.getNenner() << " = " << fixed << setprecision(18) << myBruch.getDouble();

	getchar();
	getchar();

	return 0;
}