OOP, assigment operator does not work

Question

Hi!

This is from my code:

struct R3
{
       float x;
       float y;
       float z;

       R3(float, float, float);
       R3();
};

R3::R3(float a, float b, float c)
{
        x = a;
        y = b;
        z = c;
}

R3::R3()
{
        x = 0;
        y = 0;
        z = 0;
}

struct Bodies
{
       int Mass;
       float Dist[100];
       R3 Place(float, float, float);
       R3 Speed(float, float, float);
       R3 Acc(float, float, float);

       Bodies(int, R3, R3, R3);
};

Bodies::Bodies(int M, R3 XYZ, R3 V, R3 A)
{
       Mass = M;
       Place = XYZ;
       Speed.x = V.x;
       Speed.y = V.y;
       Speed.z = V.z;
       Acc.x = A.x;
       Acc.y = A.y;
       Acc.z = A.z;
}

My problem is, that for Place = XYZ;, it's showing the error "invalid use of member (did you forget the '&'?)" and for Speed.x = V.x; "insufficient contextual information to determine type".

I'm quite new to OOP, and I don't see where the problem might be.

Could you please tell me why doesn't it work?

Thanks.

Answer 1

Place is a member function taking three floats, and you are trying to assign to it in the constructor. You can't do that. Perhaps you meant for Place to be a data member of type R3:

struct Bodies
{
    ...
    R3 Place;
    R3 Speed;
    ...
};

Answer 2

Your Place, Speed and Acc members are declared as functions. Use:

struct Bodies
{
       int Mass;
       float Dist[100];
       R3 Place;
       R3 Speed;
       R3 Acc;

instead.

And use initialization in the constructor:

Bodies::Bodies(int M, R3 XYZ, R3 V, R3 A): Mass(M), Place(XYZ), Speed( V ), Acc( A ){}

instead of assignment.

Answer 3

These are functions declarations :

R3 Place(float, float, float);
R3 Speed(float, float, float);
R3 Acc(float, float, float);

not object creations.