Дроби

#include <iostream>
#include <conio.h>
using namespace std;
 
class rational
{
public:
    int a,b,c,d,oper,res1,res2;
void init(void);
void read(void);
void proc(void);
void display(void);
};
 
void rational::read(void)
{
    cout<<"vvedit 1 drob"<<endl;
    cin>>a;
    cout<<"-"<<endl;
    cin>>b;
    cout<<"vvedit 2 drob"<<endl;
    cin>>c;
    cout<<"-"<<endl;
    cin>>d;
 
}
void rational::init(void)
{
cout<<"initialization"<<endl;
}
void rational::proc(void)
{
    cout<<"oberit bajany operaciy"<<endl;
    cout<<"1-add\n2-sub\n3-mul\n4-div\n5-equal\n6-greate\n7-less:"<<endl;
    cin>>oper;
 
    switch(oper)
    {
    case 1: cout<<"Suma:"<<endl; res1=a*d+b*c; res2=b*d;break;
    case 2: cout<<"riznucia:"<<endl; res1=a*d-b*c; res2=b*d;break;
    case 3: cout<<"dobutok:"<<endl; res1=a*c; res2=b*d;break;
    case 4: cout<<"4astka:"<<endl; res1=a*d; res2=b*c;break;
    case 5: cout<<"equals:"<<endl; res1=a/b; res2=b/c;break;
    
 
 
default: cout<<"nemae takoi operacii";
    }
}
void rational::display(void)
{
    cout<<endl<<res1<<endl<<"-"<<endl<<res2;
}
void main()
{
rational obj;
obj.init();
obj.read();
obj.proc();
obj.display();
getch();
}