include iostream include stdlib using namespace std int Nod int int wh

#include <iostream>
#include <stdlib.h>

using namespace std;

int Nod (int a, int b)
{
	while(a > 0 && b > 0)

        if(a > b)
            a %= b;

        else
            b %= a;

    return a + b;
}

class Rational
	{
public:
    int a,b; //a-числитель b-знаменатель//
		Rational (){ a=0;  b=1;}
		Rational (int chislit, int znamenat);
		Rational operator+(Rational s) ;
		Rational operator-(Rational s);
		Rational operator*(Rational s);
		Rational operator/(Rational s);
		bool operator==(Rational s);
		bool operator!=(Rational s);
        void operator+=(Rational s);
		void Print ();
		void Change(int x,int y);
		void toNormal();
};

void  Rational::toNormal()
{
    int f;
    if (a>b)
		f=Nod(a,b);
	else
		f=Nod(b,a);
	a=a/f;
	b=b/f;
}
Rational::Rational (int chislit, int znamenat)
	{
    a=chislit;
	if(znamenat)
		b=znamenat;
	else
		{cout<<"Ne mogu podelit na ZERO"<<endl;
		b=1;}
	}
Rational Rational::operator+(Rational s)
	{
	Rational Sum;
	Sum.a=a*s.b+b*s.a;
	Sum.b=b*s.b;
	Sum.toNormal();
	return Sum;
	}

Rational Rational::operator-(Rational s)
	{
	Rational Sum;
	Sum.a=a*s.b-b*s.a;
	Sum.b=b*s.b;
	Sum.toNormal();
	return Sum;
	}

Rational Rational::operator*(Rational s)
	{
	Rational Sum;
	Sum.a=a*s.a;
	Sum.b=b*s.b;
	Sum.toNormal();
	return Sum;
	}

Rational Rational::operator/(Rational s)
	{
	Rational Sum;
	Sum.a=a*s.b;
	Sum.b=b*s.a;
	if  (s.a==0)
		{cout<<"nelzia delit na Zero"<<endl;
		}
	Sum.toNormal();
	return Sum;
	}
void Rational::operator+=(Rational s)
{
    a=a*s.b+b*s.a;
	b=b*s.b;
	this->toNormal();

}

bool Rational::operator==(Rational s)
{
    if (a==s.a && b==s.b)
    return true;
    else return false;

}

bool Rational::operator!=(Rational s)
{
    if (a==s.a && b==s.b)
    return false;
    else return true;

}

void Rational::Print(){cout<<a<<"/"<<b<<endl;}

void Rational::Change (int d, int e)
	{
	a=d;
	if (e)
		b=e;
	else
	{cout<<"ne mogu delit na zero"<<endl;
	b=1;};
	this->toNormal();
	}



int main ()
{
Rational R1 (7,2), R2 (9,2), R3;
R3=R1+R2;
R1.Print();
R2.Print();
R3.Print();

cout<<(R1==R2)<<endl;

R1+=R3;
R1.Print();

return 0;
}