MPSTME: Add Complex number using Friend function

#include<iostream.h>
#include<conio.h>

class complex
{
int real,img;
public:
complex(int x,int y)
{
    real=x;
    img=y;
    cout<<real<<" + i"<<img<<endl;
}
friend void add(complex,complex);
};

void add(complex q,complex w)
{
    int real=q.real+w.real;
    int img=q.img+w.img;
    cout<<real<<" + i"<<img<<endl;
}
void main()
{
clrscr();
complex a(9,1),b(1,2);
add(a,b);
getch();
}