program to add, sub, mul ,and divide two complex numbers using classes

#include<iostream.h>
#include<conio.h>
class complex
{
 double a,b,c,d;
 public:
 void setdata();
 void add();
 void subt();
 void mult();
 void divd();
 };
 double x,y;
 void complex::setdata()
 {
  cout<<"for first number"<<endl;
  cout<<"enter real part ";
  cin>>a;
  cout<< "enter imiginary part ";
  cin>>b;
  cout<<endl;
  cout<<"for second number"<<endl;
  cout<<"enter real part ";
  cin>>c;
  cout<<"enter imiginary part ";
  cin>>d;
  cout<<endl;
  }
  void complex::add()
  {
   x=a+c;
   y=b+d;
   cout<<"addition of complex number is "<<x<<"  "<<y<<"i"<<endl;
   }
  void complex::subt()
  {
    x=a-c;
    y=b-d;
    cout<<"subtraction of complel number is "<<x<<"  "<<y<<"i"<<endl;
   }
  void complex::mult()
   {
    x=(a*c)-(b*d);
    y=(b*c)+(a*d);
    cout<<"multiple of complex number is "<<x<<"  "<<y<<"i"<<endl;
    }
   void complex::divd()
   {
    x=((a*c)+(b*d))/((c*c)+(d*d));
    y=((b*c)-(a*d))/((c*c)+(d*d));
    cout<<"divident number is "<<x<<"  "<<y<<"i"<<endl;
    }
  void main()
  {
   clrscr();
   complex c1;
   c1.setdata();
   c1.add();
   c1.subt();
   c1.mult();
   c1.divd();
   getch();
   }