Write a Program to design a class complex to represent complex numbers. The complex class shuold use an external function

#include<iostream.h>
#include<conio.h>
class complex
{ 
float x; 
float y;
public: 
void input(float real, float img) 
{ 
x=real; 
y=img; 
} 
friend complex sum(complex, complex); 
void show(complex);
};
complex sum(complex c1, complex c2)
{ 
complex c3; 
c3.x = c1.x + c2.x; 
c3.y = c1.y + c2.y; 
return (c3);
}
void complex :: show(complex c)
{ 
cout<<c.x<<"+j"<<c.y<<"\n";
}
int main()
{ 
complex A,B,C; 
A.input(3.1, 5.65); 
B.input(2.75, 1.2);
C=sum(A,B); 
cout<<"A="; 
A.show(A); 
cout<<"B="; 
B.show(B); 
cout<<"C="; 
C.show(C);   
return 0;
}