Multiplying overloaded operator

This is a discussion on Multiplying overloaded operator within the C++ Programming forums, part of the General Programming Boards category; I'm working on this complex function to multiply two complex numbers. A and B are not in the scope of ...

  1. #1
    Registered User Kayoss's Avatar
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    Multiplying overloaded operator

    I'm working on this complex function to multiply two complex numbers. A and B are not in the scope of the overloaded function. How do I get the function to read them; do I have to make a separate getFunction()?

    Code:
    #include <iostream>
    using namespace std;
    
    class Complex
    {
    private:
    
        double real;
        double img;
    
    public:
    
        Complex( double realPart = 0.0, double imagPart = 0.0 ) : real(realPart), img(imagPart)
        {
        } // default constructor
    
        ~Complex(); // destructor
    
        friend Complex operator*( const Complex &left, const Complex &right );
        friend ostream &operator<<( ostream &output, const Complex &right );
        bool operator!() const; // is entry empty? ***
    
    }; // end class Complex
    
    Complex operator*( const Complex &left, const Complex &right ) 
    {
        Complex tmp;
        tmp.real = A.real * B.real - A.img * B.img;
        tmp.img = A.real * B.img + B.real * A.img;
        cout << "C is A * B: " << tmp << "i" << endl;
        // return tmp;
    }
    
    ostream &operator<<( ostream &output, const Complex &right )
    {
        return output << "(" << right.real << ") + (" << right.img << ")i";
    }
    
    bool Complex::operator !() const // is the entry empty?
    {
    	cout << "Invalid entry." << endl;
    	real == 0.0;
    	img == 0.0;
    }
    
    Complex::~Complex()
    { 
    }
    
    int main()
    {
        Complex A(-2.5,2.0), B(5.2,1.0), C;
        C = A * B;
    
        return 0;
    }
    THE redheaded stepchild.

  2. #2
    ZuK
    ZuK is offline
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    Didn't you mean
    Code:
    Complex operator*( const Complex &left, const Complex &right ) 
    {
        Complex tmp;
        tmp.real = left.real * right.real - left.img * right.img;
        tmp.img = left.real * right.img + left.real * right.img;
        cout << "C is A * B: " << tmp << "i" << endl;
        return tmp;
    }
    Kurt

  3. #3
    Registered User Kayoss's Avatar
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    Well ha! I tried that initially, but had a couple of them switched, so I wasn't getting the correct result. Thanks much for your time Kurt!
    THE redheaded stepchild.

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