include iostream using namespace std int Nod int int if return if retu

#include <iostream>

using namespace std;

int Nod (int c, int d)
{

	if (d==0)
		return c;
	if (c%d==0)
	return 1;
	return Nod (d, c%d);
}

class Rational
	{int a,b; //a-числитель b-знаменатель//
public:
		Rational ()
		{
		    a=0;
		    b=1;
		}
		Rational (int chislit, int znamenat);
		Rational Add (const Rational&) const;
		Rational Sub (const Rational&) const;
		Rational Mult (const Rational&) const;
		Rational Div (const Rational&) const;
		void Print () const;
		void Change (int x,int y);


};
Rational::Rational (int chislit, int znamenat)
	{a=chislit;
	if(znamenat)
		b=znamenat;
	else
		{cout<<"Ne mogu podelit na ZERO"<<endl;}
	}
Rational Rational::Add (const Rational&s) const
	{
	int c;
	Rational Sum;
	Sum.a=a*s.b+b*s.a;
	Sum.b=b*s.b;
	if (Sum.a>Sum.b)
		c=Nod (Sum.b, Sum.a);
	else
	c=Nod (Sum.b, Sum.a);
	Sum.a=Sum.a/c;
	Sum.b=Sum.b/c;
	return Sum;
	}

Rational Rational::Sub (const Rational&s) const
	{
	int c;
	Rational Sum;
	Sum.a=a*s.b-b*s.a;
	Sum.b=b*s.b;
	if (Sum.a>Sum.b)
		c=Nod (Sum.b, Sum.a);
	else
	c=Nod (Sum.b, Sum.a);
	Sum.a=Sum.a/c;
	Sum.b=Sum.b/c;
	return Sum;
	}

Rational Rational::Mult (const Rational&s) const
	{
	int c;
	Rational Sum;
	Sum.a=a*s.a;
	Sum.b=b*s.b;
		if (Sum.a>Sum.b)
		c=Nod (Sum.b, Sum.a);
	else
	c=Nod (Sum.b, Sum.a);
	Sum.a=Sum.a/c;
	Sum.b=Sum.b/c;
	return Sum;
	}

Rational Rational::Div (const Rational&s) const
	{
	int c;
	Rational Sum;
	Sum.a=a*s.b;
	Sum.b=b*s.a;
	if  (s.a==0)
		{cout<<"nelzia delit na Zero"<<endl;};
	if (Sum.a>Sum.b)
		c=Nod (Sum.b, Sum.a);
	else
	c=Nod (Sum.b, Sum.a);
	Sum.a=Sum.a/c;
	Sum.b=Sum.b/c;
	return Sum;
	}
void Rational::Print () const
	{cout<<a<<"/"<<b<<endl;}
void Rational::Change (int d, int e)
	{int f;
	a=d;
	if (e)
		b=e;
	else
	{cout<<"ne mogu delit na zero"<<endl;};
	if (a>b)
		f=Nod(a,b);
	else
		f=Nod(b,a);
	a=a/f;
	b=b/f;
	}



int main ()
{
Rational R1 (7,11), R2 (0,7), R3;
R3=R1.Add(R2);
R1.Print();
R2.Print();
R3.Print();

R3=R1.Sub(R2);
R3.Print();
R3=R2.Sub(R1);
R3.Print();
R3=R1.Mult(R2);
R3.Print();
R3=R1.Div(R2);
R3.Print();



return 0;
}