Создать класс с именем Rational для выполнения арифметических действий с дробями

#include<iostream.h>
#include<time.h>
#include<conio.h>
#include<stdio.h>
#include<iomanip.h>
#include<math.h>
using std::setfill;
using std::setw;
using namespace std;
 
class Rational
{
public:
 Rational(int =1,int =1,int =1,int =1);
 void setRational(int ,int ,int ,int );
 int Plus(/*int ,int, int, int */);
 void Print1();
private:
 int ch1,ch2;
 int zn1,zn2;
 int rez_ch1,rez_zn1;
};
 
Rational::Rational(int a1,int b1,int a2,int b2)
{
 setRational(a1,b1,a2,b2);
}
 
void Rational::setRational(int aa1,int bb1, int aa2, int bb2)
{
ch1=aa1;
ch2=aa2;
if (bb1==0)
  {cout<<"ERROR, \n";
   while (bb1==0)
     {
     cout<<"set right value: ";
     cin>>bb1;
     }
  }
else zn1=bb1;
if (bb2==0)
  {cout<<"ERROR, \n";
   while (bb2==0)
     {
     cout<<"set right value: ";
     cin>>bb2;
     }
  }
else zn2=bb2;
}
 
int Rational::Plus()
{
rez_ch1=ch1*zn2+ch2*zn1;
rez_zn1=zn1*zn2;
return rez_ch1,rez_zn1;
}
 
void Rational::Print1()
{
cout<<rez_ch1<<"/"<<rez_zn1;
}
 
int main()
{
Rational r(1,0,3,4);
r.Plus();
r.Print1();
 
getch();
return 0;
}

if (bb2==0)
 {
    cout<<"ERROR, \n";
       while (bb2==0)
     { 
        cout<<"set right value: ";
        cin>>bb2;
     }
 }
 zn2=bb2;

 while (bb2==0)
 {
 cout<<"set right value: ";
 cin>>bb2;
 }
 zn2=bb2;

class Rational
{
public:
  Rational(int a = 0, int b = 1);
  Rational plus(Rational r);
private:
  int ch;
  int zn;
};
 
Rational Rational::plus(Rational r)
{
  return Rational(r.ch * zn + r.zn * ch, r.zn * zn);
}

Rational a, b, c, d;
// ... вводим a, b, c ...
Rational tmp = a.plus(b);
d = tmp.mult(c);

Rational r(1,0,3,4);
Rational r1(r);

Rational r1=r

Rational r(1,0);
Rational r1(3,4);
Rational r2(2,4);
Rational r3=r+r1-r2;

Rational Rational::plus(Rational r)
{
  return Rational(r.ch * zn + r.zn * ch, r.zn * zn);
}