#include<iostream>
using namespace std;

class Force
{
    double mass;
    double acceleration;

    public:
        Force(double m, double a);
        Force(const Force&);
        ~Force();
        double Mass(void){
            return mass;
        }
};

Force::Force(double m, double a)
{
    mass = m;
    acceleration = a;
    cout<<"Passing through the constructor with arguments\n";
}

Force::Force(const Force &g)
{
    mass = g.mass;
    acceleration = g.acceleration;
    cout<<"Passing through copy constructor.\n";
}

Force::~Force()
{
    cout<<"Passing through the destrctor.\n";
}

void idle1(Force f)
{
    cout<<"Entering function idle ONE \n\n";
}

Force idle2(Force &f)
{
    cout<<"Entering function idle TWO \n\n";
    return f;
}

Force idle3(Force *f)
{
    cout<<"Entering function idle Three\n\n";
    return (*f);
}

int main()
{
    cout<<" f1"<<endl;
    Force f1(0.0,0.0);

    cout<<" f2"<<endl;
    Force f2(4.3, 9.9);
    f1 = Force(f2); // using the copy constructor to copy attribute values
    //from source object f2 into destination object f1
    cout<<"Calling idle1"<<endl;
    idle1(f1);

    cout<<"f3"<<endl;
    Force f3(7.5, 9.8);

    cout<<"f4"<<endl;
    Force f4(0.0,0.0);

    cout<<"f4 <-copy<-f3"<<endl;
    f4 = Force(f3);

    cout<<"calling idle2"<<endl;
    Force f5 = idle2(f4);

    cout<<"Calling idle3"<<endl;
    Force f6 = idle3(&f4);

    cout<<"The mass of the final force (#6): "<< f6.Mass() <<endl;
    return 0;

}