Need help with 9.4 arithmetic

[electricb]

I've been trying to figure out this problem for over a day now, my method is called -(id) addTo (id) c. For the first step I declared result as an id object and then made that an instance of the complex class. After this step, I'm completely lost, how do we perform the arithmetic needed to define the method if we are using id objects? I can't simply use any dot notation which would make it possible to differentiate between the id objects, I can't use for example result.real = real + c.real because they are now id objects and I can't use any operators if I have to use brackets. Could somebody please toss me a bone here? This is what I have so far:

-(id) addTo:(id) c
{
    id result;
    
    result = [[Complex alloc] init];
  
    
    [result real];
    
return result;
}

[electricb]

-(id) addTo:(id)f
{
    return [self add: (id)f];
}


That's it!!?? Maybe I misunderstood the question, but I was under the impression that the add method for the Complex and Fraction classes had to be replaced with the modified add method, not used in conjunction with them. Is this solution correct, or did I miss the point entirely?