Tutorial 7 Q2 [Top-level method]

// http://pastebin.com/u/TheWhiteFang
#include <iostream>

using namespace std;

class ComplexNum{
    float m_Real;
    float m_Img;
public:
    ComplexNum(float inReal=0.0 , float inImg=0.0){// To be completed

        m_Real = inReal;
        m_Img = inImg;
    }

friend ComplexNum operator* (const ComplexNum &inVal1, const ComplexNum &inVal2);
friend ostream &operator<<(ostream &output, const ComplexNum &source);
};

//top level function
ComplexNum operator* (const ComplexNum &inVal1, const ComplexNum &inVal2)
{
    ComplexNum temp;
    temp.m_Real = (inVal1.m_Real * inVal2.m_Real)-(inVal1.m_Img * inVal2.m_Img);
    temp.m_Img = (inVal1.m_Real * inVal2.m_Img) + (inVal1.m_Img * inVal2.m_Real);


    return temp;

}

//top level global to overload stream operator
ostream &operator<<(ostream &output, const ComplexNum &source){ //return ostream by reference //only thing that changes is classname
    output << source.m_Real << " + " << source.m_Img << "i " <<endl;
    return output;
}


int main(){
    ComplexNum obj1(10.5, 20.8);
    ComplexNum obj2(31.8, 23.6);
    cout<< "Complex Num 1: " << obj1 << endl;
    cout<< "Complex Num 2: " << obj2 << endl;

    ComplexNum obj3;
    obj3 = obj1 * obj2;
    cout <<endl <<"Complex Num 1 × Complex Num 2 = ";
    cout << obj3 << endl;
    return 0;
}