C++ Program on addition, subtraction, multiplication of two Complex Numbers

   #include<iostream.h>
   #include<conio.h>
   class complex
   {
     private:
       float real,img;
     public:
       void assign(float x,float y)
     {
       real=x;
       img=y;
     }
     void print()
     {
     if(img>=0)
       cout<< real<<"+"<< img<<"i";
     else
       cout<< real<< img<<"i";
     getch();
     }
   };
   void add( float a,float b,float c, float d)
   {
     float e,f;complex g;
     e=a+c;
     f=b+d;
     g.assign(e,f);
     g.print();
   }
   void sub( float a,float b,float c, float d)
   {
     float e,f;complex g;
     e=a-c;
     f=b-d;
     g.assign(e,f);
     g.print();
   }
   void mul( float a,float b,float c, float d)
   {
     float e,f; complex g;
     e=a*c-b*d;
     f=b*c+a*d;
     g.assign(e,f);
     g.print();
   }
   void main()
   {
     float a,b,c,d;
     complex x,y,z;
     clrscr();
     cout<<" for complex 1:";
     cout<<"real part:";
     cin>>a;
     cout<<"imaginary part:";
     cin>>b;
     cout<<" for complex 2:";
     cout<<"real part:";
     cin>>c;
     cout<<"imaginary part:";
     cin>>d;
     x.assign(a,b);
     y.assign(c,d);
     cout<<"***original data:***\n";
     cout<<"Complex 1:\n";x.print();
     cout<<"\n Complex 2:\n";y.print();
     cout<<"\n***\n";
     cout<<"\n Addition:\n";add(a,b,c,d);
     cout<<"\n Subtraction:\n";sub(a,b,c,d);
     cout<<"\n Multipication:\n";mul(a,b,c,d);
   }