Operator overloading c++

clander · #1 24-Apr-2005, 14:49

I am trying to make a program that makes a complex number class that will add subtract multiply and divide complex numbers. I am trying to make my code easier by using operator overloading but am running into some errors that I am stuck on. If anyone can help please do.

CPP / C++ / C Code:

#pragma once
#include <iostream>
#include <cstdlib>
#include <cctype>
using namespace std;

class Complex
{
 public:
  Complex(double r, double i); 
  Complex();
  ~Complex();
  double getReal();
  void setReal(double r);
  double getImag();
  void setImag(double i);
  friend void operator <<(const Complex& num, ostream& out); 
  friend void operator >>(const Complex& num, ostream& in);
  friend Complex operator ==(const Complex& num1, const Complex& num2);
  friend Complex operator +(const Complex& num1, const Complex& num2); 
  friend Complex operator *(const Complex& num1, const Complex& num2);  
  friend Complex operator -(const Complex& num1, const Complex& num2);
  friend Complex operator /(const Complex& num1, const Complex& num2);
 private:
  double real;
  double imag;
};

CPP / C++ / C Code:

#include ".\complex.h"

Complex::Complex(){

 real = 0;
 imag = 0;
}

Complex::Complex(double r, double i){
 
 real = r;
 imag = i;
}

double Complex::getImag(){

 return imag;
}

double Complex::getReal(){

 return real;
}

void Complex::setImag(double i){

 imag = i;
}

void Complex::setReal(double r){

 real = r;
}

void operator <<(const Complex& num, ostream& out){

 out << num.real << "+" << num.imag << "i\n";

}

void operator >>(const Complex& num, ostream& in){

 char i;

 in >> num.real >> i >> num.imag >> i;
}

Complex operator ==(const Complex& num)
{

 Complex temp;

 temp.real = num.real;
 temp.imag = num.imag;

 return temp;
}

 Complex operator *(const Complex& num1, const Complex& num2){
 
 Complex temp;
 
 temp.real = num1.real * num2.real - num1.imag * num2.imag;
 temp.imag = num1.real * num2.imag + num1.imag * num2.real;
 
 return temp;
}

 Complex operator +(const Complex& num1, const Complex& num2){

 Complex temp;

 temp.real = num1.real + num2.real;
 temp.imag = num2.imag + num2.imag;
 
 return temp;
}

Complex operator -(const Complex& num1, const Complex& num2){

 Complex temp;

 temp.real = num1.real - num2.real;
 temp.imag = num1.imag - num2.imag;

 return temp;
}

 Complex operator /(const Complex& num1, const Complex& num2){

 Complex temp;

 temp.real = (num1.real*num2.real + 
num1.imag*num2.imag)/(num2.real*num2.real + num2.imag*num2.imag);
 temp.imag = (num1.imag*num2.real - 
num1.real*num2.imag)/(num2.real*num2.real + num2.imag*num2.imag);

 return temp;
}

Complex::~Complex(){

}

Thats the header and the cpp files

clander · #2 24-Apr-2005, 14:52

CPP / C++ / C Code:

Complex operator ==(const Complex& num)
{

 Complex temp;

 temp.real = num.real;
 temp.imag = num.imag;

 return temp;
}

I am getting several errors with this part of the code
It says it cannt acces the private members, even though I used "friend"

ubergeek · #3 24-Apr-2005, 21:08

Quote:

Originally Posted by clander

I used "friend"

no you didn't. look over the friend declarations. you are mixing up member and non-member functions. all of your functions (==, +, -, *, /) seem like they should be implemented as member functions. and in your second post (the one i quoted) you showed me a member function (although you omitted the Complex:

. all the friend declarations are for non-member functions. Also, your operator == function is incorrect. what you are doing is what the operator = function should be doing (assignment). == is for testing equality:

CPP / C++ / C Code:

bool Complex::operator== (Complex &other_one)
{
if (this->real == other_one.real) && (this->imag == other_one.imag) return true;
else return false;
//or whatever. this is simple test of private member equality.
}

the above is implemented as a member function, btw.

here is a great reference on operator overloading:
http://www.csse.monash.edu.au/~jonmc...html/text.html
other references can easily be found using google.

clander · #4 25-Apr-2005, 10:12

I am also getting other errors with my use of the << and >> operators

It says that there is no operator found which takes a right hand operand of type Complex

I did also put in the Complex:: and it gave me errors for that when I took them out the errors went away which I thought was unusual but I looked in a book and they didn't have it in there either.

clander · #5 25-Apr-2005, 10:21

Also when I tried to do what you showed as an example it says that there is an error with the arrow and this it says left of ->imag must point to class/struct/union and the same with ->real

also it give me a error saying hat Complex::imag cannot access private member declared in class complex

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