operator overloading errors

[scwizzo]

Im trying to over load the / + * - operators, but cannot find a descent tutorial on doing so. Yes I've read up on overloading, and it is probably not a good idea till I know exactly what i'm doing, but I have to learn sometime. I'm not sure on who to use the functions in the program after I have written the implementation. How does the ostream work after overloading it? The same as before, or is there a new way of setting it up? Is what I have for the main so far correct?

#include <iostream>
#include <cstdlib>

bool division = false;
bool subtract = false;
bool add = false;
bool mult = false;

using namespace std;

class COMPLEX;

ostream operator<<(ostream&,const COMPLEX&);
istream operator>>(istream&, COMPLEX&);

class COMPLEX{

    private:

        int real, imaginary; //initial values
        int realfin,imfin;
        
    public:

        COMPLEX(); //defines default constructor
        ~COMPLEX(); //destructor

        COMPLEX operator/(COMPLEX&);
        COMPLEX operator+(COMPLEX&);
        COMPLEX operator*(COMPLEX&);
        COMPLEX operator-(COMPLEX&);

    friend ostream operator>>(istream&,const COMPLEX&);
    friend istream operator>>(istream&, COMPLEX&);

}comp1,comp2,final; //define the classes to be used



// This is the main .cpp file, the other implementations are above this

istream operator>>(istream &strm, COMPLEX &obj){
    cout<<"enter a real and imaginary number\n";
    strm>> real >> imaginary;
    
    cout<<"enter a second real and imaginary number\n";
    strm>> obj.real >> obj.imaginary;
    
    return strm;
}


int main(){

    int real, imag;
    cin>>comp1;

    final = comp1 * comp2;
    cout<<final;
    final = comp1 / comp2;
    cout<<final;
    final = comp1 + comp2;
    cout<<final;
    final = comp1 - comp2;

}

[anon]

istream& operator>>(istream &strm, COMPLEX &obj){
    cout<<"enter a real and imaginary number\n";
    strm>> real >> imaginary;
    
    cout<<"enter a second real and imaginary number\n";
    strm>> obj.real >> obj.imaginary;
    
    return strm;
}

Why do you expect this overload to read two complex numbers? And what do you expect to do with real and imaginary?
Also, you'll need to return the streams as a reference.

I suggest a usage such as:

int main(){

    //int real, imag; //what are these for?

//no global objects
    COMPLEX comp1, comp2, final;
    cin >> comp1 >> comp2; //read some value into both

    final = comp1 * comp2;
    cout<<final;
    final = comp1 / comp2;
    cout<<final;
    final = comp1 + comp2;
    cout<<final;
    final = comp1 - comp2;
    cout << final;
}

That is, you have some general problems that have nothing to do with operator overloading.

As to the math operators: they should not change neither the lefthand nor the righthand value, so these methods should be const and their argument should be a const reference.

[iMalc]

    friend ostream& operator<<(istream&,const COMPLEX&);
    friend istream& operator>>(istream&, COMPLEX&);

[scwizzo]

thanks guys, i think i need to do a lot more reading on this.