Tutorial 7 Q1 [Top-Level method]

// http://pastebin.com/u/TheWhiteFang
// Tutorial 7 Q1 [Top-Level method]
#include <iostream>
using namespace std;

class Distance{ //by default, member variables are private

    int m_Kilometre;
    int m_Metre;
    int m_Centimetre;

public:

    Distance(double inVal = 0.0) //both a default or parametrized constructor  //need to add for temp to work
    {

        //inval =2.5359
        m_Kilometre = (int)inVal;
        m_Metre = (inVal - (double)m_Kilometre)*1000.0; //(2.539 -2)*1000 = 535 //double casting and .0 to avoid ambiguity in compiler
        m_Centimetre = (((inVal - (double)m_Kilometre) * 1000.0) - m_Metre) * 100;




    } //constructor
    friend Distance operator+ (const Distance &inVal1, const Distance &inVal2);
    friend ostream &operator<<(ostream &output, const Distance &source);
};

//top level function needs to be global

Distance operator+ (const Distance &inVal1, const Distance &inVal2)
{
    Distance temp;
    temp.m_Centimetre = inVal1.m_Centimetre + inVal2.m_Centimetre;

    if(temp.m_Centimetre >=100){
        temp.m_Metre++;
        temp.m_Centimetre = temp.m_Centimetre - 100;
    }

    temp.m_Metre += inVal1.m_Metre + inVal2.m_Metre;//+= to add present value of temp.m_metre
    if(temp.m_Metre >=1000){
        temp.m_Kilometre++;
        temp.m_Metre = temp.m_Metre - 1000;
    }

    temp.m_Kilometre += inVal1.m_Kilometre + inVal2.m_Kilometre; //+= will add original value instead of overwriting
    return temp; //temp will be stored in val3
}

//top level global function
ostream &operator<<(ostream &output, const Distance &source){ //return ostream by reference //only thing that changes is classname
    output << source.m_Kilometre << "km " << source.m_Metre << "m " << "and " << source.m_Centimetre <<"cm "<<endl;
    return output;
}


int main()
{
    Distance val1(2.5359);
    Distance val2(3.7769);
    Distance val3;

    cout<< "Value 1 is: " << val1 << endl;
    cout<< "Value 2 is: " << val2 << endl << endl;
    val3 = val1 + val2;
    cout << val1 << " + " << val2 << " = " << val3<< endl;
    cout << endl << endl;

    return 0;
}