realisation.~cpp

The realization of Simplex Method. It can be very useful for students. But there is only one problem

//---------------------------------------------------------------------------
#include "Realisation.h"
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int qRational::NOD (int x, int y) {
	int ost=x%y;
	while (ost!=0) {
		x=y;
		y=ost;
		ost=x%y;
	}
	return y;
};
//---------------------------------------------------------------------------

void Rational::Abbr () {
	sign = 1;
	if (p<0) { p = -p; sign = -sign; }
	if (q<0) { q = -q; sign = -sign; }
	int gcd = NOD (p, q);
	p /= gcd;
	q /= gcd;
};
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Rational operator - (Rational a, Rational b) {
	int pp = a.sign*a.p*b.q - b.sign*b.p*a.q;
	int qq = a.q*b.q;
	Rational x (pp, qq);
	return x;
};
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Rational operator + (Rational a, Rational b) {
	int pp = a.sign*a.p*b.q + b.sign*b.p*a.q;
	int qq = a.q*b.q;
	Rational x (pp, qq);
	return x;
};
//---------------------------------------------------------------------------

Rational operator * (Rational a, Rational b) {
	int K = a.sign*b.sign;
	int pp = K*(a.p*b.p);
	int qq = a.q*b.q;
	Rational x (pp, qq);
	return x;
};
//---------------------------------------------------------------------------

Rational Rational::inv () {
	if (sign == -1) p=-p;
	int pp = q;
	int qq = p;
	Rational x (pp, qq);
	return x;
};
//---------------------------------------------------------------------------

Rational operator / (Rational a, Rational b) {
	return a*b.inv();
};
//---------------------------------------------------------------------------