how can i debug an error saying illegal structure operation ??? plz help

[sumanpoonia]

#include<iostream.h>
#include<conio.h>
#include<string.h>
#include<stdio.h>
class complex
{
int real,imag;
public:
void read()
{
cout<<"enter real part:\n";
cin>>real;
cout<<"enter the imag part:\n";
cin>>imag;
}
void display()
{
cout<<"\n"<<real<<"+"<<imag<<"\n";
}
complex add(complex a2)
{
complex temp;
temp.real=real+temp.real;
temp.imag=imag+temp.imag;
return temp;
}
complex subtract(complex a2)
{
complex temp;
temp.real=real-temp.real;
temp.imag=imag-temp.imag;
return temp;
}
complex multi(complex a2)
{
complex temp;
temp.real=(real*a2.real)-(a2.imag*imag);
temp.imag=(real*a2.imag)+(imag*a2.real);
return temp;
}
complex division(complex a2)
{
complex temp;
temp.real=((real*a2.real)+(imag*a2.imag))/((imag*a2.imag)*(real*a2.real));
temp.imag=((imag*a2.real)-(real*a2.imag))/((imag*a2.imag)*(real*a2.real));
return temp;
}
};
void main()
{
int ch;
clrscr();
complex a,b,c;
do
{
cout<<"enter\n 1.addition  2.subtraction  3.multiplication  4.division  5.exit\n";
cout<<"enter ur choice:\n";
cin>>ch;
switch(ch)
{
case 1:cout<<"enter 1st complex no:";
       a.read();
       a.display();
       cout<<"enter 2nd complex no:";
       b.read();
       b.display();
       c=a+b;
       c.display();
       break;
case 2:cout<<"enter 1st complex no:";
       a.read();
       a.display();
       cout<<"enter 2nd complex no:";
       b.read();
       b.display();
       c=b-a;
       c.display();
       break;
case 3:cout<<"enter 1st complex no:";
       a.read();
       a.display();
       cout<<"enter 2nd complex no:";
       b.read();
       b.display();
       c=a*b;
       c.display();
       break;
case 4:cout<<"enter 1st complex no:";
       a.read();
       a.display();
       cout<<"enter 2nd complex no:";
       b.read();
       b.display();
       c=a/b;
       c.display();
       break;
}
}while(1);
}

[weaknessforcats]

You have class named complex to work with complex numbers. Like this:

complex a,b,c;
//get values for a and b
 
        c = a + b;
 

which is all fine except the compiler doesn't know how to handle the + operation on your class. Ditto for -,+, and /.

You need to write operator methods for your class and then it will compile.

complex complex::operator+(complex& rhs)
{
     //add this and the argument
     //return the result}

[sumanpoonia]

thanx it works.....:)