Question

I am making a Camera class in c++ that I use for OpenGL. When I try to print any variable that was declared in Camera.h, the program crashes. But it does not crash if I set or get the value of the variable What am I doing wrong?

Camera.h

    #ifndef CAMERA_H
    #define CAMERA_H

    class Camera
    {
        public:
            Camera();
            Camera(float xP, float yP, float zP);
            void move(float x, float y, float z);

        protected:
        private:
            float xPos, yPos, zPos;
    };

    #endif // CAMERA_H

Camera.cpp

    #include "Camera.h"
    #include <iostream>
    #include <GL/glut.h>

    using namespace std;

    Camera::Camera()
    {
    }

    Camera::Camera(float xP, float yP, float zP)
    : xPos(xP), yPos(yP), zPos(zP)
    {
    }

    void Camera::move(float x, float y, float z)
    {
        glTranslatef(-x, -y, -z);
        //None of this crashes:
        xPos = 1;
        yPos = xPos;
        //Crashes here:
        cout << "mainCamera x = " << xPos << endl;
    }

The crash message I get is:

opengl.exe has encountered a problem and needs to close. We are sorry for the inconvenience.

---

Edit

If I put the line float xPos, yPos, zPos; in the public section in Camera.h, and call

    Camera mainCamera(0.0f, 0.0f, 0.0f);
    cout << "mainCamera x = " << mainCamera.xPos << endl;

…in the main.cpp, it works just fine and prints:

mainCamera x = 0

Answer 1

Well, I figured it out. And this one was a dumb one. I forgot to include windows.h in Main.cpp, which for some reason weird reason it stopped floats from being printed out (???). It works perfectly now.

#include <windows.h>